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Full Discussion: Usage of sed, position of apostrophe
Top Forums UNIX for Beginners Questions & Answers Usage of sed, position of apostrophe Post 303022806 by Scott on Friday 7th of September 2018 12:49:24 PM
Old 09-07-2018
The quotes are there in instruct the shell (with regards, for example, to the expansion of shell variables in the case of using single quotes - where the shell would not expand them). In this case, it generally doesn't matter whether you put the closing quote before or after the g.

Code:
$ echo 123123 | sed 's/3/_THREE_/g'
12_THREE_12_THREE_
$ echo 123123 | sed 's/3/_TH'REE_/g
12_THREE_12_THREE_

But it is important that you use the correct ones. e.g.
Code:
$ T=_THREE_

$ echo 123123 | sed '/s/3/$T/g'
12$T12$T

$ echo 123123 | sed 's/3/'$T/g
12_THREE_12_THREE_

$ echo 123123 | sed "s/3/$T/g"
12_THREE_12_THREE_

Logically, someone might ask "why put the closing quote there?", as it could look odd, but it's not so important with regard to your example.
This User Gave Thanks to Scott For This Post:
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LEARN ABOUT DEBIAN

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)
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