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Full Discussion: Using sed to remove paragraphs with variables
Top Forums UNIX for Dummies Questions & Answers Using sed to remove paragraphs with variables Post 302211341 by BlueberryPickle on Thursday 3rd of July 2008 06:07:34 AM
Old 07-03-2008
Using sed to remove paragraphs with variables
Hi everyone,

I have a file with multiple entries and I would like to remove the ones that contain either /A"> or /A/, where A can be any letter of the alphabet. Here's an example of the entries:
<Topic r:id="Top/World/Fran">
<catid>476</catid>
<link r:resource="http://fr.news.yahoo.com/"/>
<link r:resource="http://news.google.fr/"/>
<link r:resource="http://actualite.free.fr"/>
</Topic>
<Topic r:id="Top/World/Fran/Act/A_la_Une">
<catid>32293</catid>
<link r:resource="http://www.pluralworld.com/"/>
<link r:resource="http://www.webdopresse.ch/"/>
</Topic>
<Topic r:id="Top/World/Fran/A">
<catid>32069</catid>
</Topic>
<Topic r:id="Top/World/Fran/B/Stuff">
<catid>32069</catid>
</Topic>
So, in this case, I want to have a new file that does not keep the last two entries as the first contains /A"> and the second contains /B/.

I have tried with the following code, but it removes everything!

#!/bin/sh
# Removes topics that begin with a certain value
inputFile=$1

tempFile=$inputFile.tmp

# A number of indexing categories exist that have to be removed
ALPHABET="ABCDEFGHIJKLMNOPQRSTUVWXYZ"
n=0

while [ $n -lt ${#ALPHABET} ]
do
sed -n '/\/${ALPHABET:n:1}\">/,/<\/Topic>/!p' $tempFile.start > $tempFile.end
mv $tempFile.end $tempFile.start

sed -n '/\/${ALPHABET:n:1}\//,/<\/Topic>/!p' $tempFile.start > $tempFile.end
mv $tempFile.end $tempFile.start

n=$(( $n + 1 ))
done

Can anyone out there please help?
 

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LEARN ABOUT LINUX

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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