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Top Forums Shell Programming and Scripting How to replace words in file? Post 302928362 by junior-helper on Thursday 11th of December 2014 07:20:40 AM
Old 12-11-2014
s sed command: substitute
Ram regexp
Shyam replacement
g sed pattern flag: global substitution
-i sed command line option: "in place" editing

In other words, substitute every occurrence of Ram with Shyam and also change it in the file.

One problem could be that the mentioned sed command doesn't really ensure to match Ram as a single word, so it will also replace Ram in Ramesh, Rammstein and so on, too.

This awk might be more robust
Code:
awk '{ for (i=1;i<=NF;i++) if ($i == "Ram") { $i = "Shyam" }; print }' file

for (i=1;i<=NF;i++) in every line, parse every field
if ($i == "Ram") { $i = "Shyam" } if a field equals Ram, change that field to Shyam
print after all fields in a line are parsed (and potentially modified), print the whole line

Quote:
share any good link
Sed - An Introduction and Tutorial is pretty Smilie

Hope this helps.

---------- Post updated at 02:20 PM ---------- Previous update was at 02:17 PM ----------

Two are better than one...
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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)
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