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UNIX for Dummies Questions & Answers
Help with sed substitution
Post 302379767 by Scrutinizer on Saturday 12th of December 2009 04:28:59 AM
12-12-2009
Moderator
Quote:
yes , but he still hit a snag and had to figure out how to solve greediness. and that's why i suggest not using regex for such a task, where fields are clearly delimited by "|" and he can just go split the string on "|", go through them, check for "tcolor" and change it. there's no need to create regex (and on top of that, take care of greediness ) for that simple task. Sometimes, things can be done simple.
Code:
awk -F"|" '{for(i=1;i<=NF;i++){if($i~/^tcolor/){$i="tocolor=blue"}};print }' OFS="|"
( do I spot a tiny bit of regex in there BTW? )Last edited by Scrutinizer; 12-12-2009 at 05:59 AM..
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LEARN ABOUT DEBIAN
dpkg-awk
DPKG-AWK(1) General Commands Manual DPKG-AWK(1) NAME
dpkg-awk - Utility to read a dpkg style db file SYNOPSIS
dpkg-awk [(-f|--file) filename] [(-d|--debug) ##] [(-s|--sort) list] [(-rs|--rec_sep) ??] '<fieldname>:<regex>' ... -- <out_fieldname> .. DESCRIPTION
dpkg-awk Parses a dpkg status file (or other similarly formatted file) and outputs the resulting records. It can use regex on the field values to limit the returned records, it can also be told which fields to output, and it can sort the matched fields. OPTIONS
-f filename --file filename The file to parse. The default is /var/lib/dpkg/status. -d [#] --debug [#] Each time this is specified, it increased the debug level. -s field(s) --sort field(s) A space or comma separated list of fields to sort on. -n field(s) --numeric field(s) A space or comma separated list of fields that should be interpreted as numeric in value. -rs ?? --rec_sep ?? Output this string at the end of each output paragraph. -h --help Display some help. fieldname The fields from the file, that are matched with the regex given. The fieldnames are case insensitive. out_fieldname The fields from the file, that are output for each record. If the first field listed begins with ^, then the list of fields that follows will NOT be output. BUGS
Be warned that the author has only a shallow understanding of the dpkg packaging system, so there are probably tons of bugs in this pro- gram. This program comes with no warranties. If running this program causes fire and brimstone to rain down upon the earth, you will be on your own. This program accesses the dpkg database directly in places, querying for data that cannot be gotten via dpkg. AUTHOR
Adam Heath <doogie@debian.org> DEBIAN
Debian Utilities DPKG-AWK(1)