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Full Discussion: copying one field to another
Top Forums Shell Programming and Scripting copying one field to another Post 302275936 by musica on Monday 12th of January 2009 02:54:18 PM
Old 01-12-2009
copying one field to another

Hi,

I am trying to copy one field to another only on lines that match a certain string. Here is what i have tried:

awk '/nch/' {gsub($3,$5,$0)}' file

I need to copy $5 (field) to $3 if the line contains "nch"
I have never used gsub and am not sure if this is the right way.

file:
----------------------------------------
mod pad1 pad2 pad3 pad4 col row etc
nch pad4 pad5 pad6 pad7 col1 row1 time
nch pad2 pad3 pad5 pad8 col row date
----------------------------------------

Thanks for any suggestions.
 

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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)
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