dialog
--clear
dialog --create-rc file
dialog --print-maxsize
dialog common-options box-options
Step 2
#!/bin/bash #test whith displaying info from installing programs echo "Installing program" > test.tet && emerge -av cat >> test.tet #install package from gentoo, also can be 'apt-get install' while [ 1 ] do dialog --tailboxbg "test.tet" 80 100 && sleep 1; done ##What does it do ? Test to display info from output of installation progressexample added by maxim251
It has no sense to use both --textbox and
--tailbox.
Use --textbox to display the whole
file, use --tailbox to display only the last
lines of the file.
For example, the following command will display the content of
the whole file todo.txt in a dialog textbox of size
20x80.
dialog --textbox todo.txt 20 80
The dialog sources contain several samples of how to use the different box options and how they look. Just take a look into the directory samples/ of the source.
If in X, here is a post that contains a script monitors
/dev/input/event:
The important command is:
sudo hexdump -e '48/1 "%x " "\n"' /dev/input/event1 | awk '( $29 == 1) { print "PRESS: " $13 } ( $29 == 0 ) { print "RELEASE: " $13 }'
Naturally, you need to have sudo permissions,
otherwise it will become what that post suggests...
You need to use quoting to get the redirection to happen in the
right place; as written, the output of the xterm
itself (which is probably empty) is being redirected. You also
need to specify a shell, since xterm -e will
otherwise exec the command directly; redirection
requires the shell.
xterm -e sh -c 'dialog --inputbox "Enter your first name" 10 40 2>/tmp/input.'$$
x=`cat /tmp/input.$$`
You may want to consider using something like zenity
or kdialog instead of dialog, in order
to avoid the extra xterm.
(And in bash the second line is better written as
x=$(< /tmp/input.$$).)
Dialog is a program that will let you to present a variety of questions or display messages using dialog boxes from a shell script. These types of dialog boxes are implemented (though not all are necessarily compiled into dialog):
calendar, checklist, dselect, editbox, form, fselect, gauge, infobox, inputbox, inputmenu, menu, mixedform, mixedgauge, msgbox (message), passwordbox, passwordform, pause, prgbox, programbox, progressbox, radiolist, tailbox, tailboxbg, textbox, timebox, and yesno (yes/no).
You can put more than one dialog box into a script:
Some widgets, e.g., checklist, will write text to dialog’s output. Normally that is the standard error, but there are options for changing this: "--output-fd", "--stderr" and "--stdout". No text is written if the Cancel button (or ESC) is pressed; dialog exits immediately in that case.
All options begin with "--" (two ASCII hyphens, for the benefit of those using systems with deranged locale support).
A "--" by itself is used as an escape, i.e., the next token on the command-line is not treated as an option.
dialog --title -- --Not an option
The "--args" option tells dialog to list the command-line parameters to the standard error. This is useful when debugging complex scripts using the "--" and "--file", since the command-line may be rewritten as these are expanded.
The "--file" option tells dialog to read parameters from the file named as its value.
dialog --file parameterfile
Blanks not within double-quotes are discarded (use backslashes to quote single characters). The result is inserted into the command-line, replacing "--file" and its option value. Interpretation of the command-line resumes from that point. If parameterfile begins with "&", dialog interprets the following text as a file descriptor number rather than a filename.
Common
Options
--ascii-lines
Rather than draw graphics lines around boxes, draw ASCII "+" and "-" in the same place. See also "--no-lines".
--aspect ratio
This gives you some control over the box dimensions when using auto sizing (specifying 0 for height and width). It represents width / height. The default is 9, which means 9 characters wide to every 1 line high.
--backtitle backtitle
Specifies a backtitle string to be displayed on the backdrop, at the top of the screen.
--begin y x
Specify the position of the upper left corner of a dialog box on the screen.
--cancel-label string
Override the label used for "Cancel" buttons.
--clear
Clears the widget screen, keeping only the screen_color background. Use this when you combine widgets with "--and-widget" to erase the contents of a previous widget on the screen, so it won’t be seen under the contents of a following widget. Understand this as the complement of "--keep-window". To compare the effects, use these:
All three widgets visible, staircase effect, ordered 1,2,3:
dialog \
--begin 2 2 --yesno "" 0 0 \
--and-widget --begin 4 4 --yesno "" 0 0 \
--and-widget --begin 6 6 --yesno "" 0 0
Only the last widget is left visible:
dialog \
--clear --begin 2 2 --yesno "" 0 0 \
--and-widget --clear --begin 4 4 --yesno "" 0 0 \
--and-widget --begin 6 6 --yesno "" 0 0
All three widgets visible, staircase effect, ordered 3,2,1:
dialog \
--keep-window --begin 2 2 --yesno "" 0 0 \
--and-widget --keep-window --begin 4 4 --yesno ""
0 0 \
--and-widget --begin 6 6 --yesno "" 0 0
First and third widget visible, staircase effect, ordered 3,1:
dialog \
--keep-window --begin 2 2 --yesno "" 0 0 \
--and-widget --clear --begin 4 4 --yesno "" 0 0 \
--and-widget --begin 6 6 --yesno "" 0 0
Note, if you want to restore original console colors and send your cursor home after the dialog program has exited, use the clear (1) command.
--colors
Interpret embedded "\Z" sequences in the dialog text by the following character, which tells dialog to set colors or video attributes: 0 through 7 are the ANSI used in curses: black, red, green, yellow, blue, magenta, cyan and white respectively. Bold is set by ’b’, reset by ’B’. Reverse is set by ’r’, reset by ’R’. Underline is set by ’u’, reset by ’U’. The settings are cumulative, e.g., "\Zb\Z1" makes the following text bold (perhaps bright) red. Restore normal settings with "\Zn".
--column-separator string
Tell dialog to split data for radio/checkboxes and menus on the occurrences of the given string, and to align the split data into columns.
--cr-wrap
Interpret embedded newlines in the dialog text as a newline on the screen. Otherwise, dialog will only wrap lines where needed to fit inside the text box. Even though you can control line breaks with this, Dialog will still wrap any lines that are too long for the width of the box. Without cr-wrap, the layout of your text may be formatted to look nice in the source code of your script without affecting the way it will look in the dialog.
See also the "--no-collapse" and "--trim" options.
--create-rc file
When dialog supports run-time configuration, this can be used to dump a sample configuration file to the file specified by file.
--date-format format
If the host provides strftime, this option allows you to specify the format of the date printed for the --calendar widget. The time of day (hour, minute, second) are the current local time.
--defaultno
Make the default value of the yes/no box a No. Likewise, make the default button of widgets that provide "OK" and "Cancel" a Cancel. If "--nocancel" or "--visit-items" are given those options overrides this, making the default button always "Yes" (internally the same as "OK").
--default-item string
Set the default item in a checklist, form or menu box. Normally the first item in the box is the default.
--exit-label string
Override the label used for "EXIT" buttons.
--extra-button
Show an extra button, between "OK" and "Cancel" buttons.
--extra-label string
Override the label used for "Extra" buttons. Note: for inputmenu widgets, this defaults to "Rename".
--help-button
Show a help-button after "OK" and "Cancel" buttons, i.e., in checklist, radiolist and menu boxes. If "--item-help" is also given, on exit the return status will be the same as for the "OK" button, and the item-help text will be written to dialog’s output after the token "HELP". Otherwise, the return status will indicate that the Help button was pressed, and no message printed.
--help-label string
Override the label used for "Help" buttons.
--help-status
If the help-button is selected, writes the checklist, radiolist or form information after the item-help "HELP" information. This can be used to reconstruct the state of a checklist after processing the help request.
--hfile filename
Display the given file using a textbox when the user presses F1.
--hline string
Display the given string centered at the bottom of the widget.
--ignore
Ignore options that dialog does not recognize. Some well-known ones such as "--icon" are ignored anyway, but this is a better choice for compatibility with other implementations.
--input-fd fd
Read keyboard input from the given file descriptor. Most dialog scripts read from the standard input, but the gauge widget reads a pipe (which is always standard input). Some configurations do not work properly when dialog tries to reopen the terminal. Use this option (with appropriate juggling of file-descriptors) if your script must work in that type of environment.
--insecure
Makes the password widget friendlier but less secure, by echoing asterisks for each character.
--item-help
Interpret the tags data for checklist, radiolist and menu boxes adding a column which is displayed in the bottom line of the screen, for the currently selected item.
--keep-tite
When built with ncurses, dialog normally checks to see if it is running in an xterm, and in that case tries to suppress the initialization strings that would make it switch to the alternate screen. Switching between the normal and alternate screens is visually distracting in a script which runs dialog several times. Use this option to allow dialog to use those initialization strings.
--keep-window
Normally when dialog performs several tailboxbg widgets connected by "--and-widget", it clears the old widget from the screen by painting over it. Use this option to suppress that repainting.
At exit, dialog repaints all of the widgets which have been marked with "--keep-window", even if they are not tailboxbg widgets. That causes them to be repainted in reverse order. See the discussion of the "--clear" option for examples.
--max-input size
Limit input strings to the given size. If not specified, the limit is 2048.
--no-cancel
--nocancel
Suppress the "Cancel" button in checklist, inputbox and menu box modes. A script can still test if the user pressed the ESC key to cancel to quit.
--no-collapse
Normally dialog converts tabs to spaces and reduces multiple spaces to a single space for text which is displayed in a message boxes, etc. Use this option to disable that feature. Note that dialog will still wrap text, subject to the "--cr-wrap" and "--trim" options.
--no-kill
Tells dialog to put the tailboxbg box in the background, printing its process id to dialog’s output. SIGHUP is disabled for the background process.
--no-label string
Override the label used for "No" buttons.
--no-lines
Rather than draw lines around boxes, draw spaces in the same place. See also "--ascii-lines".
--no-mouse
Do not enable the mouse.
--no-nl-expand
Do not convert "\n" substrings of the message/prompt text into literal newlines.
--no-ok
--no-shadow
Suppress shadows that would be drawn to the right and bottom of each dialog box.
--ok-label string
Override the label used for "OK" buttons.
--output-fd fd
Direct output to the given file descriptor. Most dialog scripts write to the standard error, but error messages may also be written there, depending on your script.
--separator
string
--output-separatorstring
Specify a string that will separate the output on dialog’s output from checklists, rather than a newline (for --separate-output) or a space. This applies to other widgets such as forms and editboxes which normally use a newline.
--print-maxsize
Print the maximum size of dialog boxes, i.e., the screen size, to dialog’s output. This may be used alone, without other options.
--print-size
Prints the size of each dialog box to dialog’s output.
--print-version
Prints dialog’s version to dialog’s output. This may be used alone, without other options. It does not cause dialog to exit by itself.
--scrollbar
For widgets holding a scrollable set of data, draw a scrollbar on its right-margin. This does not respond to the mouse.
--separate-output
For checklist widgets, output result one line at a time, with no quoting. This facilitates parsing by another program.
--separate-widget string
Specify a string that will separate the output on dialog’s output from each widget. This is used to simplify parsing the result of a dialog with several widgets. If this option is not given, the default separator string is a tab character.
--shadow
Draw a shadow to the right and bottom of each dialog box.
--single-quoted
Use single-quoting as needed (and no quotes if unneeded) for the output of checklist’s as well as the item-help text. If this option is not set, dialog uses double quotes around each item. That requires occasional use of backslashes to make the output useful in shell scripts.
--size-err
Check the resulting size of a dialog box before trying to use it, printing the resulting size if it is larger than the screen. (This option is obsolete, since all new-window calls are checked).
--sleep secs
Sleep (delay) for the given number of seconds after processing a dialog box.
--stderr
Direct output to the standard error. This is the default, since curses normally writes screen updates to the standard output.
--stdout
Direct output to the standard output. This option is provided for compatibility with Xdialog, however using it in portable scripts is not recommended, since curses normally writes its screen updates to the standard output. If you use this option, dialog attempts to reopen the terminal so it can write to the display. Depending on the platform and your environment, that may fail.
--tab-correct
Convert each tab character to one or more spaces (for the textbox widget; otherwise to a single space). Otherwise, tabs are rendered according to the curses library’s interpretation.
--tab-len n
Specify the number of spaces that a tab character occupies if the "--tab-correct" option is given. The default is 8. This option is only effective for the textbox widget.
--time-format format
If the host provides strftime, this option allows you to specify the format of the time printed for the --timebox widget. The day, month, year values in this case are for the current local time.
--timeout secs
Timeout (exit with error code) if no user response within the given number of seconds. This is overridden if the background "--tailboxbg is used. A timeout of zero seconds is ignored.
--title title
Specifies a title string to be displayed at the top of the dialog box.
--trace filename
logs the command-line parameters, keystrokes and other information to the given file. If dialog reads a configure file, it is logged as well. Piped input to the gauge widget is logged. Use control/T to log a picture of the current dialog window.
The dialog program handles some command-line parameters specially, and removes them from the parameter list as they are processed. For example, if the first option is --trace, then that is processed (and removed) before dialog initializes the display.
See also the "--cr-wrap" and "--no-collapse" options.
--version
Prints dialog’s version to the standard output, and exits. See also "--print-version".
--visit-items
Modify the tab-traversal of checklist, radiobox, menubox and inputmenu to include the list of items as one of the states. This is useful as a visual aid, i.e., the cursor position helps some users.
When this option is given, the cursor is initially placed on the list. Abbreviations (the first letter of the tag) apply to the list items. If you tab to the button row, abbreviations apply to the buttons.
--yes-label string
Override the label used for "Yes" buttons.
Box
Options
All dialog boxes have at least three parameters:
height
the height of the dialog box.
width
the width of the dialog box.
Other
parameters depend on the box type.
--calendar text height width day month year
A calendar box displays month, day and year in separately adjustable windows. If the values for day, month or year are missing or negative, the current date’s corresponding values are used. You can increment or decrement any of those using the left-, up-, right- and down-arrows. Use vi-style h, j, k and l for moving around the array of days in a month. Use tab or backtab to move between windows. If the year is given as zero, the current date is used as an initial value.
On exit, the date is printed in the form day/month/year. The format can be overridden using the --date-format option.
--checklist text height width list-height [ tag item status ] ...
A checklist box is similar to a menu box; there are multiple entries presented in the form of a menu. Another difference is that you can indicate which entry is currently selected, by setting its status to on. Instead of choosing one entry among the entries, each entry can be turned on or off by the user. The initial on/off state of each entry is specified by status.
On exit, a list of the tag strings of those entries that are turned on will be printed on dialog’s output. If the "--separate-output" option is not given, the strings will be quoted to make it simple for scripts to separate them. See the "--single-quoted" option, which modifies the quoting behavior.
--dselect filepath height width
The directory-selection dialog displays a text-entry window in which you can type a directory, and above that a windows with directory names.
Here filepath can be a filepath in which case the directory window will display the contents of the path and the text-entry window will contain the preselected directory.
Use tab or arrow keys to move between the windows. Within the directory window, use the up/down arrow keys to scroll the current selection. Use the space-bar to copy the current selection into the text-entry window.
Typing any printable characters switches focus to the text-entry window, entering that character as well as scrolling the directory window to the closest match.
Use a carriage return or the "OK" button to accept the current value in the text-entry window and exit.
On exit, the contents of the text-entry window are written to dialog’s output.
--editbox filepath height width
The edit-box dialog displays a copy of the file. You may edit it using the backspace, delete and cursor keys to correct typing errors. It also recognizes pageup/pagedown. Unlike the --inputbox, you must tab to the "OK" or "Cancel" buttons to close the dialog. Pressing the "Enter" key within the box will split the corresponding line.
On exit, the contents of the edit window are written to dialog’s output.
--form text height width formheight [ label y x item y x flen ilen ] ...
The form dialog displays a form consisting of labels and fields, which are positioned on a scrollable window by coordinates given in the script. The field length flen and input-length ilen tell how long the field can be. The former defines the length shown for a selected field, while the latter defines the permissible length of the data entered in the field.
Use up/down arrows (or control/N, control/P) to move between fields. Use tab to move between windows.
On exit, the contents of the form-fields are written to dialog’s output, each field separated by a newline. The text used to fill non-editable fields (flen is zero or negative) is not written out.
--fselect filepath height width
The fselect (file-selection) dialog displays a text-entry window in which you can type a filename (or directory), and above that two windows with directory names and filenames.
Here filepath can be a filepath in which case the file and directory windows will display the contents of the path and the text-entry window will contain the preselected filename.
Use tab or arrow keys to move between the windows. Within the directory or filename windows, use the up/down arrow keys to scroll the current selection. Use the space-bar to copy the current selection into the text-entry window.
Typing any printable characters switches focus to the text-entry window, entering that character as well as scrolling the directory and filename windows to the closest match.
Typing the space character forces dialog to complete the current name (up to the point where there may be a match against more than one entry).
Use a carriage return or the "OK" button to accept the current value in the text-entry window and exit.
On exit, the contents of the text-entry window are written to dialog’s output.
--gauge text height width [percent]
A gauge box displays a meter along the bottom of the box. The meter indicates the percentage. New percentages are read from standard input, one integer per line. The meter is updated to reflect each new percentage. If the standard input reads the string "XXX", then the first line following is taken as an integer percentage, then subsequent lines up to another "XXX" are used for a new prompt. The gauge exits when EOF is reached on the standard input.
The percent value denotes the initial percentage shown in the meter. If not specified, it is zero.
On exit, no text is written to dialog’s output. The widget accepts no input, so the exit status is always OK.
--infobox text height width
An info box is basically a message box. However, in this case, dialog will exit immediately after displaying the message to the user. The screen is not cleared when dialog exits, so that the message will remain on the screen until the calling shell script clears it later. This is useful when you want to inform the user that some operations are carrying on that may require some time to finish.
On exit, no text is written to dialog’s output. Only an "OK" button is provided for input, but an ESC exit status may be returned.
--inputbox text height width [init]
An input box is useful when you want to ask questions that require the user to input a string as the answer. If init is supplied it is used to initialize the input string. When entering the string, the backspace, delete and cursor keys can be used to correct typing errors. If the input string is longer than can fit in the dialog box, the input field will be scrolled.
On exit, the input string will be printed on dialog’s output.
--inputmenu text height width menu-height [ tag item ] ...
An inputmenu box is very similar to an ordinary menu box. There are only a few differences between them:
RENAMED <tag> <item>
--menu text height width menu-height [ tag item ] ...
As its name suggests, a menu box is a dialog box that can be used to present a list of choices in the form of a menu for the user to choose. Choices are displayed in the order given. Each menu entry consists of a tag string and an item string. The tag gives the entry a name to distinguish it from the other entries in the menu. The item is a short description of the option that the entry represents. The user can move between the menu entries by pressing the cursor keys, the first letter of the tag as a hot-key, or the number keys 1-9. There are menu-height entries displayed in the menu at one time, but the menu will be scrolled if there are more entries than that.
On exit the tag of the chosen menu entry will be printed on dialog’s output. If the "--help-button" option is given, the corresponding help text will be printed if the user selects the help button.
--mixedform text height width formheight [ label y x item y x flen ilen itype ] ...
The mixedform dialog displays a form consisting of labels and fields, much like the --form dialog. It differs by adding a field-type parameter to each field’s description. Each bit in the type denotes an attribute of the field:
--mixedgauge text height width percent [ tag1 item1 ] ...
A mixedgauge box displays a meter along the bottom of the box. The meter indicates the percentage.
It also displays a list of the tag- and item-values at the top of the box. See dialog(3) for the tag values.
The text is shown as a caption between the list and meter. The percent value denotes the initial percentage shown in the meter.
No provision is made for reading data from the standard input as --gauge does.
On exit, no text is written to dialog’s output. The widget accepts no input, so the exit status is always OK.
--msgbox text height width
A message box is very similar to a yes/no box. The only difference between a message box and a yes/no box is that a message box has only a single OK button. You can use this dialog box to display any message you like. After reading the message, the user can press the ENTER key so that dialog will exit and the calling shell script can continue its operation.
If the message is too large for the space, dialog may allow you to scroll it, provided that the underlying curses implementation is capable enough. In this case, a percentage is shown in the base of the widget.
On exit, no text is written to dialog’s output. Only an "OK" button is provided for input, but an ESC exit status may be returned.
--pause text height width seconds
A pause box displays a meter along the bottom of the box. The meter indicates how many seconds remain until the end of the pause. The pause exits when timeout is reached or the user presses the OK button (status OK) or the user presses the CANCEL button or Esc key.
--passwordbox text height width [init]
A password box is similar to an input box, except that the text the user enters is not displayed. This is useful when prompting for passwords or other sensitive information. Be aware that if anything is passed in "init", it will be visible in the system’s process table to casual snoopers. Also, it is very confusing to the user to provide them with a default password they cannot see. For these reasons, using "init" is highly discouraged. See "--insecure" if you do not care about your password.
On exit, the input string will be printed on dialog’s output.
--passwordform text height width formheight [ label y x item y x flen ilen ] ...
This is identical to --form except that all text fields are treated as password widgets rather than inputbox widgets.
--prgbox text command
height width
--prgbox command height width
A prgbox is very similar to a programbox.
This dialog box is used to display the output of a command that is specified as an argument to prgbox.
After the command completes, the user can press the ENTER key so that dialog will exit and the calling shell script can continue its operation.
If three parameters are given, it displays the text under the title, delineated from the scrolling file’s contents. If only two parameters are given, this text is omitted.
--programbox text
height width
--programbox height width
A programbox is very similar to a progressbox. The only difference between a program box and a progress box is that a program box displays an OK button (but only after the command completes).
This dialog box is used to display the piped output of a command. After the command completes, the user can press the ENTER key so that dialog will exit and the calling shell script can continue its operation.
If three parameters are given, it displays the text under the title, delineated from the scrolling file’s contents. If only two parameters are given, this text is omitted.
--progressbox text
height width
--progressbox height width
A progressbox is similar
to an tailbox, except that
a) rather than displaying the contents of a file,
it displays the piped output of a command and
b) it will exit when it reaches the end of the file
(there is no "OK" button).
If three parameters are given, it displays the text under the title, delineated from the scrolling file’s contents. If only two parameters are given, this text is omitted.
--radiolist text height width list-height [ tag item status ] ...
A radiolist box is similar to a menu box. The only difference is that you can indicate which entry is currently selected, by setting its status to on.
On exit, the name of the selected item is written to dialog’s output.
--tailbox file height width
Display text from a file in a dialog box, as in a "tail -f" command. Scroll left/right using vi-style ’h’ and ’l’, or arrow-keys. A ’0’ resets the scrolling.
On exit, no text is written to dialog’s output. Only an "OK" button is provided for input, but an ESC exit status may be returned.
--tailboxbg file height width
Display text from a file in a dialog box as a background task, as in a "tail -f &" command. Scroll left/right using vi-style ’h’ and ’l’, or arrow-keys. A ’0’ resets the scrolling.
Dialog treats the background task specially if there are other widgets (--and-widget) on the screen concurrently. Until those widgets are closed (e.g., an "OK"), dialog will perform all of the tailboxbg widgets in the same process, polling for updates. You may use a tab to traverse between the widgets on the screen, and close them individually, e.g., by pressing ENTER. Once the non-tailboxbg widgets are closed, dialog forks a copy of itself into the background, and prints its process id if the "--no-kill" option is given.
On exit, no text is written to dialog’s output. Only an "EXIT" button is provided for input, but an ESC exit status may be returned.
NOTE: Older versions of dialog forked immediately and attempted to update the screen individually. Besides being bad for performance, it was unworkable. Some older scripts may not work properly with the polled scheme.
--textbox file height width
A text box lets you display the contents of a text file in a dialog box. It is like a simple text file viewer. The user can move through the file by using the cursor, page-up, page-down and HOME/END keys available on most keyboards. If the lines are too long to be displayed in the box, the LEFT/RIGHT keys can be used to scroll the text region horizontally. You may also use vi-style keys h, j, k, l in place of the cursor keys, and B or N in place of the page-up and page-down keys. Scroll up/down using vi-style ’k’ and ’j’, or arrow-keys. Scroll left/right using vi-style ’h’ and ’l’, or arrow-keys. A ’0’ resets the left/right scrolling. For more convenience, vi-style forward and backward searching functions are also provided.
On exit, no text is written to dialog’s output. Only an "EXIT" button is provided for input, but an ESC exit status may be returned.
--timebox text height [width hour minute second]
A dialog is displayed which allows you to select hour, minute and second. If the values for hour, minute or second are missing or negative, the current date’s corresponding values are used. You can increment or decrement any of those using the left-, up-, right- and down-arrows. Use tab or backtab to move between windows.
On exit, the result is printed in the form hour:minute:second. The format can be overridden using the --time-format option.
--yesno text height width
A yes/no dialog box of size height rows by width columns will be displayed. The string specified by text is displayed inside the dialog box. If this string is too long to fit in one line, it will be automatically divided into multiple lines at appropriate places. The text string can also contain the sub-string "\n" or newline characters ’\n’ to control line breaking explicitly. This dialog box is useful for asking questions that require the user to answer either yes or no. The dialog box has a Yes button and a No button, in which the user can switch between by pressing the TAB key.
On exit, no text is written to dialog’s output. In addition to the "Yes" and "No" exit codes (see DIAGNOSTICS) an ESC exit status may be returned.
The codes used for "Yes" and "No" match those used for "OK" and "Cancel", internally no distinction is made.
Obsolete Options
--beep-after
Beep after a user has completed a widget by pressing one of the buttons.
You may want to write scripts which run with other dialog "clones".
ORIGINAL DIALOG
First, there is the "original" dialog program to consider
(versions 0.3 to 0.9). It had some misspelled (or inconsistent)
options. The dialog program maps those deprecated options
to the preferred ones. They include:
XDIALOG
Technically, "Xdialog", this is an X application. With
some care, it is possible to write useful scripts that work with
both Xdialog and dialog.
The dialog program ignores these options which are recognized by Xdialog:
Xdialog’s manpage has a section discussing its compatibility with dialog.
WHIPTAIL
Then there is whiptail. For practical purposes, it is
maintained by Debian. Its documentation claims
whiptail(1) is a lightweight replacement for dialog(1),
to provide dialog boxes for shell scripts.
It is built on the
newt windowing library rather than the ncurses library,
allowing
it to be smaller in embedded enviroments such as installers,
rescue disks, etc.
whiptail is designed to be drop-in compatible with dialog,
but
has less features: some dialog boxes are not implemented,
such
as tailbox, timebox, calendarbox, etc.
Comparing actual sizes (Debian testing, 2007/1/10): The total of sizes for whiptail, the newt, popt and slang libraries is 757kb. The comparable number for dialog (counting ncurses) is 520kb. Disregard the first paragraph.
The second paragraph is misleading, since whiptail also does not work for common options of dialog, such as the gauge box. whiptail is less compatible with dialog than the decade-old original dialog 0.4 program.
whiptail’s manpage borrows features from dialog, e.g., --default-item (2000), --output-fd (2002), but oddly cites only dialog versions up to 0.4 (1996) as a source. That is, its manpage refers to features which were borrowed from more recent versions of dialog, e.g., the --gauge and --password boxes, as well as options such as --separate-output (2008). Somewhat humorously, one may note that the popt feature (undocumented in its manpage) of using a "--" as an escape was documented in dialog’s manpage about a year before it was mentioned in whiptail’s manpage. whiptail’s manpage incorrectly attributes that to getopt (and is inaccurate anyway).
Debian uses whiptail for the official dialog variation.
The dialog program ignores or maps these options which are recognized by whiptail:
Kiran Cherupally - the mixed form and mixed gauge widgets.
Tobias C. Rittweiler
Valery Reznic - the form and progressbox widgets.
Yura Kalinichenko adapted the gauge widget as "pause".
This is a rewrite (except as needed to provide compatibility) of the earlier version of dialog 0.9a, which lists as authors:
Savio Lam - version 0.3, "dialog"
Stuart Herbert - patch for version 0.4
Marc Ewing - the gauge widget.
Pasquale De Marco "Pako" - version 0.9a, "cdialog"
Exit status is subject to being overridden by environment variables. The default values and corresponding environment variables that can override them are:
0
if dialog is exited by pressing the Yes or OK button (DIALOG_OK).
1
if the No or Cancel button is pressed (DIALOG_CANCEL).
2
if the Help button is pressed (DIALOG_HELP).
3
if the Extra button is pressed (DIALOG_EXTRA).
4
if the Help button is pressed (DIALOG_HELP), or the --item-help option is set when the Help button is pressed (DIALOG_ITEM_HELP),
-1
if errors occur inside dialog (DIALOG_ERROR) or dialog is exited by pressing the ESC key (DIALOG_ESC).
Define this variable to apply any of the common options to each widget. Most of the common options are reset before processing each widget. If you set the options in this environment variable, they are applied to dialog’s state after the reset. As in the "--file" option, double-quotes and backslashes are interpreted.
The "--file" option is not considered a common option (so you cannot embed it within this environment variable).
Define this variable if you want to specify the name of the configuration file to use.
DIALOG_ITEM_HELP
DIALOG_OK
Define any of these variables to change the exit code on Cancel (1), error (-1), ESC (255), Extra (3), Help (2), Help with --item-help (2), or OK (0). Normally shell scripts cannot distinguish between -1 and 255.
DIALOG_TTY
Set this variable to "1" to provide compatibility with older versions of dialog which assumed that if the script redirects the standard output, that the "--stdout" option was given.
$HOME/.dialogrc
default configuration file
You can override or add to key bindings in dialog by adding to the configuration file. Dialog’s bindkey command maps single keys to its internal coding.
bindkey widget curses_key dialog_key
The widget name can be "*" (all widgets), or specific widgets such as textbox. Specific widget bindings override the "*" bindings. User-defined bindings override the built-in bindings.
The curses_key can be any of the names derived from curses.h, e.g., "HELP" from "KEY_HELP". Dialog also recognizes ANSI control characters such as "^A", "^?", as well as C1-controls such as "~A" and "~?". Finally, it allows any single character to be escaped with a backslash.
Dialog’s internal keycode names correspond to the DLG_KEYS_ENUM type in dlg_keys.h, e.g., "HELP" from "DLGK_HELP".
Widget Names
Some widgets (such as the formbox) have an area where fields can
be edited. Those are managed in a subwindow of the widget, and
may have separate keybindings from the main widget because the
subwindows are registered using a different name.
Some widgets are actually other widgets, using internal settings to modify the behavior. Those use the same widget name as the actual widget:
Built-in Bindings
This manual page does not list the key bindings for each widget,
because that detailed information can be obtained by running
dialog. If you have set the --trace option,
dialog writes the key-binding information for each widget
as it is registered.
Example
Normally dialog uses different keys for navigating between
the buttons and editing part of a dialog versus navigating within
the editing part. That is, tab (and back-tab) traverse buttons
(or between buttons and the editing part), while arrow keys
traverse fields within the editing part. Tabs are also recognized
as a special case for traversing between widgets, e.g., when
using multiple tailboxbg widgets.
Some users may wish to use the same key for traversing within the editing part as for traversing between buttons. The form widget is written to support this sort of redefinition of the keys, by adding a special group in <code>dlgk_keys.h</code> for "form" (left/right/next/prev). Here is an example binding demonstrating how to do this:
bindkey formfield TAB form_NEXT
bindkey formbox TAB form_NEXT
bindkey formfield BTAB form_prev
bindkey formbox BTAB form_prev
That type of redefinition would not be useful in other widgets, e.g., calendar, due to the potentially large number of fields to traverse.
Dialog works with X/Open curses. However, some implementations have deficiencies:
-
HPUX curses (and perhaps others) do not open the terminal properly for the newterm function. This interferes with dialog’s --input-fd option, by preventing cursor-keys and similar escape sequences from being recognized.
-
NetBSD 5.1 curses has incomplete support for wide-characters. dialog will build, but not all examples display properly.
1.
Create a sample configuration file by typing:
"dialog --create-rc <file>"
2.
At start, dialog determines the settings to use as follows:
a)
if environment variable DIALOGRC is set, its value determines the name of the configuration file.
b)
if the file in (a) is not found, use the file $HOME/.dialogrc as the configuration file.
c)
if the file in (b) is not found, try using the GLOBALRC file determined at compile-time, i.e., /etc/dialogrc.
d)
if the file in (c) is not found, use compiled in defaults.
3.
Edit the sample configuration file and copy it to some place that dialog can find, as stated in step 2 above.
Perhaps.
Thomas E. Dickey (updates for 0.9b and beyond)