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Full Discussion: Need help with sed and regexp
Top Forums Shell Programming and Scripting Need help with sed and regexp Post 302692397 by Don Cragun on Monday 27th of August 2012 02:37:22 PM
Old 08-27-2012
Quote:
Originally Posted by Boxtuna
I have actually noticed two small issues with the suggeted script;

1. an empty lien in the input file will be removed in the output file

2. the more serious issue is that any line that has teh pattern "123" will be completely removed. Example:
Code:
      stop_bin "926","mem_ddr_iobist_vmax"

got removed in the output file, while it shouldn't.

How can I change teh condition /"(-*[0-9.]+)"/ to also include the " ="?
You aren't giving us enough information:
1. When lines that don't match the format of the lines you said your input file contained in your first message appear, are they just supposed to be copied to the output?
2. If one of these lines appears appears after a line like "name" = "1";and before an associated line like "2" = "";, what is supposed to happen?
3. Will there ever be lines with more than one <equals-sign> character? If so, what is supposed to be done with them?
4. Will there ever be lines with one <equals-sign> character that is not in one of the two forms specified in your first message? If so, what is supposed to be done with them?
 

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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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