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Top Forums Shell Programming and Scripting sed replacing specific characters and control characters by escaping Post 302633901 by ijustneeda on Wednesday 2nd of May 2012 04:08:06 PM
Old 05-02-2012
Single quotes seem to fail in following cases:
Code:
echo "abc- cde fg ' hi" | sed -e 's/[\.\/\%'=:\(\)\`_\'\@\;\+\*\#\$\?\!]/ /g'
echo "abc- cde fg ' hi" | sed -e 's/[\.\/\%'=:\(\)\`_"'"\@\;\+\*\#\$\?\!]/ /g'

As single quotes cannot be escaped with a backslash and double quotes like to evaluate, looks like double quotes is a best bet in my case.

Still investigating if we use sed double quoted "" escape normal character such as number 1 as \1 inside the sed, will it replace the \ and 1 as well, I know it \$ evaluates to $?

---------- Post updated at 01:08 PM ---------- Previous update was at 01:02 PM ----------

Quote:
Originally Posted by ijustneeda
Single quotes seem to fail in following cases:
Code:
echo "abc- cde fg ' hi" | sed -e 's/[\.\/\%'=:\(\)\`_\'\@\;\+\*\#\$\?\!]/ /g'
echo "abc- cde fg ' hi" | sed -e 's/[\.\/\%'=:\(\)\`_"'"\@\;\+\*\#\$\?\!]/ /g'

As single quotes cannot be escaped with a backslash and double quotes like to evaluate, looks like double quotes is a best bet in my case.

Still investigating if we use sed double quoted "" escape normal character such as number 1 as \1 inside the sed, will it replace the \ and 1 as well, I know it \$ evaluates to $?
Bad example of \1 as it is back reference Smilie, let me use \A
echo "abc-A \ cde fg A \ hi" | sed -e "s/\A/ /g"
abc- \ cde fg \ hi
does not replace '\'
 

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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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