sed multiline substitution if a condition holds Post: 302566338

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Top Forums Shell Programming and Scripting sed multiline substitution if a condition holds Post 302566338 by plsrn on Thursday 20th of October 2011 07:45:59 AM

10-20-2011

Registered User

Ok, now it works. I slighlty modified your final suggestion using the following code. Thanks a lot for your (really impressive) effort in helping me!

Quote:

#!/bin/sh

AWKFILE=`basename $0`_$$.awk

[[ -f $AWFILE ]] && rm $AWKFILE

while IFS=',' read VN AN TN RN
do
cat >> $AWKFILE <<EOFILE
/$VN\.$TN *= *'[^']*'/ {
match (\$0, "(.*)$VN.$TN *= *'([^']*)';(.*)",statements);

${VN}_type=statements[2];

if ( ${VN}_apply != "" ) {
if ( ${VN}_apply == "true" ) {
printf ("%s$VN.$RN = '%s'; %s\n", statements[1], ${VN}_type, statements[3]);
}
else {
printf ("%s$VN.$RN = ''; %s\n", statements[1], statements[3]);
}
}
else {
printf ("%s%s\n", statements[1], statements[3]);
}
}
/$VN\.$AN *= *[^;]*/ {
match (\$0, "(.*)$VN.$AN *= *([^;]*) *;(.*)",statements);

${VN}_apply=statements[2];

if ( ${VN}_type != "" ) {
if ( ${VN}_apply == "true") {
printf ("%s$VN.$RN = '%s'; %s\n", statements[1], ${VN}_type, statements[3]);
}
else {
printf ("%s$VN.$RN = ''; %s\n", statements[1], statements[3]);
}
}
else {
printf ("%s%s\n", statements[1], statements[3]);
}
}
EOFILE

if [ -z "$exclstr" ]
then
exclstr="$VN.$AN|$VN.$TN"
else
exclstr=$exclstr"|$VN.$AN|$VN.$TN"
fi

done < $2

cat >> $AWKFILE <<EOFILE
\$0 !~ /($exclstr) *= *[^;]*/ {
print;
}
EOFILE

gawk -f $AWKFILE $1

rm $AWKFILE

plsrn

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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)