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UNIX for Dummies Questions & Answers
sed across multiple files
Post 13510 by Kelam_Magnus on Friday 18th of January 2002 09:24:30 AM
01-18-2002
tweak script
I have a minor change to your script. Which will do the job.
Make a file with the listing of the files you want to change. This might be necessary if the directory your 40 files are in has other files that you don't want to change in it.
Make a file with only the filenames of your 40 files in it. Then do the script this way. (with backtics)
for x in `cat filename`
do
sed "s/, LA/,LA/g" $x > temp
cat temp > $x
rm temp
done
By default the 'sed' command will output all lines, even the ones it doesn't modify. If you did only want the lines that you modified to be output use this option 'sed -n ....'. This will suppress all lines that weren't modified.
Now that I think about it, you really don't need the 'rm temp' because your line, "sed "s/, LA/,LA/g" $x > temp", has only the '>' which will overwrite the temp file each time you come thru the 'for loop'.
So this will work as well.
for x in `cat filename`
do
sed "s/, LA/,LA/g" $x > temp
cat temp > $x
done
Make a file with the listing of the files you want to change. This might be necessary if the directory your 40 files are in has other files that you don't want to change in it.
Make a file with only the filenames of your 40 files in it. Then do the script this way. (with backtics)
for x in `cat filename`
do
sed "s/, LA/,LA/g" $x > temp
cat temp > $x
rm temp
done
By default the 'sed' command will output all lines, even the ones it doesn't modify. If you did only want the lines that you modified to be output use this option 'sed -n ....'. This will suppress all lines that weren't modified.
Now that I think about it, you really don't need the 'rm temp' because your line, "sed "s/, LA/,LA/g" $x > temp", has only the '>' which will overwrite the temp file each time you come thru the 'for loop'.
So this will work as well.
for x in `cat filename`
do
sed "s/, LA/,LA/g" $x > temp
cat temp > $x
done
This User Gave Thanks to Kelam_Magnus For This Post:
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LEARN ABOUT LINUX
shtool-subst
SHTOOL-SUBST.TMP(1) GNU Portable Shell Tool SHTOOL-SUBST.TMP(1) NAME
shtool-subst - GNU shtool sed(1) substitution operations SYNOPSIS
shtool subst [-v|--verbose] [-t|--trace] [-n|--nop] [-w|--warning] [-q|--quiet] [-s|--stealth] [-i|--interactive] [-b|--backup ext] [-e|--exec cmd] [-f|--file cmd-file] [file] [file ...] DESCRIPTION
This command applies one or more sed(1) substitution operations to stdin or any number of files. OPTIONS
The following command line options are available. -v, --verbose Display some processing information. -t, --trace Enable the output of the essential shell commands which are executed. -n, --nop No operation mode. Actual execution of the essential shell commands which would be executed is suppressed. -w, --warning Show warning on substitution operation resulting in no content change on every file. The default is to show a warning on substitution operations resulted in no content change on all files. -q, --quiet Suppress warning on substitution operation resulting in no content change. -s, --stealth Stealth operation. Preserve timestamp on file. -i, --interactive Enter interactive mode where the user has to approve each operation. -b, --backup ext Preserve backup of original file using file name extension ext. Default is to overwrite the original file. -e, --exec cmd Specify sed(1) command directly. -f, --file cmd-file Read sed(1) command from file. EXAMPLE
# shell script shtool subst -i -e 's;(c) ([0-9]*)-2000;(c) 1-2001;' *.[ch] # RPM spec-file %install shtool subst -v -n -e 's;^(prefix=).*;1 $RPM_BUILD_ROOT%{_prefix};g' -e 's;^(sysconfdir=).*;1 $RPM_BUILD_ROOT%{_prefix}/etc;g' `find . -name Makefile -print` make install HISTORY
The GNU shtool subst command was originally written by Ralf S. Engelschall <rse@engelschall.com> in 2001 for GNU shtool. It was prompted by the need to have a uniform and convenient patching frontend to sed(1) operations in the OpenPKG package specifications. SEE ALSO
shtool(1), sed(1). 18-Jul-2008 shtool 2.0.8 SHTOOL-SUBST.TMP(1)