Simple windowing shell
?fileName arg arg ...?
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a simple program consisting of the Tcl command language, the
Tk toolkit, and a main program that reads commands from
standard input or from a file. It creates a main window and
then processes Tcl commands. If wish is invoked with
no arguments, or with a first argument that starts with
’’-’’, then it reads Tcl
commands interactively from standard input. It will continue
processing commands until all windows have been deleted or
until end-of-file is reached on standard input. If there
exists a file .wishrc in the home directory of the
user, wish evaluates the file as a Tcl script just
before reading the first command from standard input.
is invoked with an initial fileName argument, then
fileName is treated as the name of a script file.
Wish will evaluate the script in fileName
(which presumably creates a user interface), then it will
respond to events until all windows have been deleted.
Commands will not be read from standard input. There is no
automatic evaluation of .wishrc when the name of a
script file is presented on the wish command line,
but the script file can always source it if
automatically processes all of the command-line options
described in the OPTIONS summary above. Any other
command-line arguments besides these are passed through to
the application using the argc and argv
variables described later.
application name and class
The name of the application, which is used for purposes such as
send commands, is taken from the -name option, if
it is specified; otherwise it is taken from fileName, if
it is specified, or from the command name by which wish
was invoked. In the last two cases, if the name contains a
’’/’’ character, then only the characters
after the last slash are used as the application name.
The class of the application, which is used for purposes such as
specifying options with a RESOURCE_MANAGER property or
.Xdefaults file, is the same as its name except that the first
letter is capitalized.
When wish is invoked interactively it normally prompts for
each command with ’’% ’’. You can
change the prompt by setting the variables tcl_prompt1 and
tcl_prompt2. If variable tcl_prompt1 exists then it
must consist of a Tcl script to output a prompt; instead of
outputting a prompt wish will evaluate the script in
tcl_prompt1. The variable tcl_prompt2 is used in a
similar way when a newline is typed but the current command
isn’t yet complete; if tcl_prompt2 isn’t set
then no prompt is output for incomplete commands.
If you create a Tcl script in a file whose first line is
then you can invoke the script file directly from your shell if
you mark it as executable. This assumes that wish has been
installed in the default location in /usr/local/bin; if
it’s installed somewhere else then you’ll have to
modify the above line to match. Many UNIX systems do not allow
the #! line to exceed about 30 characters in length, so be
sure that the wish executable can be accessed with a short
An even better approach is to start your script files with the
following three lines:
# the next line restarts using wish \
exec wish "$0" "$@"
This approach has three advantages over the approach in the
previous paragraph. First, the location of the wish binary
doesn’t have to be hard-wired into the script: it can be
anywhere in your shell search path. Second, it gets around the
30-character file name limit in the previous approach. Third,
this approach will work even if wish is itself a shell
script (this is done on some systems in order to handle multiple
architectures or operating systems: the wish script
selects one of several binaries to run). The three lines cause
both sh and wish to process the script, but the
exec is only executed by sh. sh processes
the script first; it treats the second line as a comment and
executes the third line. The exec statement cause the
shell to stop processing and instead to start up wish to
reprocess the entire script. When wish starts up, it
treats all three lines as comments, since the backslash at the
end of the second line causes the third line to be treated as
part of the comment on the second line.
The end of a script file may be marked either by the physical end
of │ the medium, or by the character, ’\032’
(’\u001a’, control-Z). If this │ character is
present in the file, the wish application will read text
│ up to but not including the character. An application
that requires │ this character in the file may encode it as
’’\x1a’’, or │
’’\u001a’’; or may generate it by use of
commands such as format or │ binary.
Wish sets the following Tcl variables:
Contains a count of the number of arg arguments (0 if
none), not including the options described above.
Contains a Tcl list whose elements are the arg arguments
that follow a -- option or don’t match any of the
options described in OPTIONS above, in order, or an empty string
if there are no such arguments.
Contains fileName if it was specified. Otherwise, contains
the name by which wish was invoked.
If the -geometry option is specified, wish copies
its value into this variable. If the variable still exists after
fileName has been evaluated, wish uses the value of
the variable in a wm geometry command to set the main
Contains 1 if wish is reading commands interactively
(fileName was not specified and standard input is a
terminal-like device), 0 otherwise.