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Full Discussion: Doubt in sed
Top Forums UNIX for Dummies Questions & Answers Doubt in sed Post 302597343 by Scrutinizer on Friday 10th of February 2012 03:52:28 AM
Old 02-10-2012
Quote:
Originally Posted by chmod666
I hope this was not too confusing and correct ;-)
Almost. The quotes and double quotes need not be escaped (by a backslash), the backslash needs to be escaped only once, but in the first sed it needs an extra escape (because of the weak double quotes) from the shell. This should be equivalent:
Code:
sed "s/'/\\\'/g" | sed 's/"/\\"/g'

---------- Post updated at 09:48 ---------- Previous update was at 09:10 ----------

@sri3001: I can't reproduce, nor explain the behavior of your third example:
What OS are you on? Could you post the output of
Code:
od -c sr1.txt

---------- Post updated at 09:52 ---------- Previous update was at 09:48 ----------

Quote:
Originally Posted by chmod666
Edit: now that I could test it, i find the first line to be confusing indeed as I don't get why it leaves an open pipe...
The pipe is not open, it feeds the output of the first sed into the sed on the second line.
Last edited by Scrutinizer; 02-10-2012 at 04:18 AM..
This User Gave Thanks to Scrutinizer For This Post:
chmod666
 

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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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