replace
a string-replacement utility
Synopsis
add an example, a script, a trick and tips
examples
source
Can I replace Windows with Wine?
I would first check to see if the games that you are playing have
a Linux port already. This way you could avoid using Wine or
Parallels in order to play them.
I haven't had great experience running newer windows games
(especially newer FPS titles) through an emulator such as Wine.
As far as partitioning your HDD to dual boot windows and linux,
if you are going to be in windows most of the time playing games,
I would devote about 60% of the HDD space to windows and the
other 40% to your linux installation.
Windows cannot read ext4 partitions AFAIK. Although I do believe
that there are a few programs out there that will let you browse
the partitions from within windows.
source
Replaces images\(.*)" with images/\1" in all files?
Check if this works for you
sed "s/images\\\/images\\//g"
source
Automatic replacement of expressions
What you are looking for is called "Pattern Capture", where a
particular pattern matched by a regular expression is saved in a
variable. The details of how this is done depend on the language
used (Perl, awk, sed or whatever).
Your problem is a bit more complicated because:
-
You should not parse HTML
with regular expressions
-
Regular expressions become more complicated in most languages
when your search pattern spans multiple lines.
-
Since you have not included a sample of your actual code, it
is harder for me to find a unique pattern with which to
anchor my regular expression. In the script below I am using
<moreCodeThatAlwaysStaysTheSame> and
.someCodeAndOth you will need to change that to
reflect actual unique patterns that flank the text you want
to replace.
-
You should not parse HTML with regular expressions
All that said, here is a Perl script that will replace the
patterns you gave in your question:
#!/usr/bin/perl
###############################################
# This sets the line separator to a string #
# instead of a new line (\n). Use something #
# that uniquely delimits the code you want to #
# replace. #
###############################################
local $/="<moreCodeThatAlwaysStaysTheSame>";
#######################################################
# Read the input file, line by line. Remember that #
# because of the previous command, a line is expected #
# to end with "<moreCodeThatAlwaysStaysTheSame>" #
#######################################################
while (<>) {
#####################################################
# $str is what we want to replace the pattern with. #
# "XXX" will be replaced by the correct mp3. #
#####################################################
my $str=<<Eof;
<audio controls="controls">
<source src="XXXX" type="audio/mpeg">
<embed height="50" width="100" src="XXXX">
</audio>
Eof
###########################################################
# Match the entire string we will replace AND the #
# mp3 we are looking for. In Perl (and other languages) #
# placing a regex pattern in (parentheses) captures it. #
# We can now refer to the 1st captured pattern as $1, the #
# second as $2 etc. #
###########################################################
/(.someCodeAndOth.+?src=.+\/(.+?\.mp3).+?$)/s;
###################################################
# Save the matches into variables, otherwise they #
# will be lost at the next match operation. #
###################################################
my ($match,$rep,$mp3)=($1,$1,$2);
###################################################
# Replace "XXXX" with the appropriate mp3 in $str #
###################################################
$str=~s/XXXX/$mp3/g;
#########################################
# Replace the matched pattern with $str #
#########################################
s/$match/$str/;
#################
# Print it out! #
#################
print;
}
Save that script as foo.pl and run it on your file
as follows:
perl foo.pl input_file.html > output_file.html
source
How do I exclude match and change only specific character with sed
From your code snippet, the sed expression looks
correct - it will replace every '0' character with the characters
'correct'. If you only want the output from your
echo command to be updated, you could put the
sed command on the output from echo,
eg:
some command
date >> /file.txt
echo $? | sed 's/0/correct/' >> /file.txt
(note removing 'echo' and 'cat' commands will have no effect on
the output)
In the context you're using the -i option, it's
actually a commandline option, rather than a sed
script command - it's a different section in the man
page:
-i[SUFFIX], --in-place[=SUFFIX]
edit files in place (makes backup if extension supplied)
This means it will update the source file (which is precisely
what you want in your example).
However, note that in this example, the exit code being checked
is the exit code of date, and not your command. In
fact in your example, it's checking the exit code of
echo, which I suspect is even less helpful for you.
A more standard way of performing this check would be along the
lines of:
some command
result=$?
date >> /file.txt
if [ $result -eq 0 ]
then
echo "Command finished successfully" >> /file.txt
else
echo "Command failed with exit code $result" >> /file.txt
fi
description
The
replace utility program changes strings in place in
files or on the standard input.
Invoke
replace in one of the following ways:
shell>
replace from to [from to] ...
-- file_name
[file_name] ...
shell> replace from to [from
to] ... < file_name
from
represents a string to look for and to represents its
replacement. There can be one or more pairs of strings.
Use the
-- option to indicate where the
string-replacement list ends and the file names begin.
In this case, any file named on the command line is modified
in place, so you may want to make a copy of the original
before converting it. replace prints a message
indicating which of the input files it actually
modifies.
If the
-- option is not given, replace
reads the standard input and writes to the standard
output.
replace
uses a finite state machine to match longer strings first.
It can be used to swap strings. For example, the following
command swaps a and b in the given files, file1 and
file2:
shell>
replace a b b a -- file1 file2 ...
The
replace program is used by msql2mysql. See
msql2mysql(1).
replace
supports the following options.
•
-?, -I
Display a help
message and exit.
•
-#debug_options
Enable
debugging.
•
-s
Silent mode.
Print less information what the program does.
•
-v
Verbose mode.
Print more information about what the program does.
•
-V
Display version
information and exit.
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