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Top Forums UNIX for Beginners Questions & Answers Replace a field in a comma separated file Post 303044866 by H squared on Thursday 5th of March 2020 01:50:15 PM
Old 03-05-2020
Thanks.

I am writing a wrapper script to call the awk (say driver.awk) script

Code:
# Skip the 1st argument as it is the file name
shift
# fetch the argument values, in comma separated form
arg_list=`echo $* | tr ' ' ','`

awk -v fld='$arg_list' -f driver.awk file.txt > file.tmp

However, I get the following error:

awk: The field -1 cannot be less than 0.

Now, if i hard code the fields to be transformed, then it works fine.

Code:
awk -v fld='8,12' -f driver.awk file.txt > file.tmp

Could you please suggest a way to dynamically set the fields to be transformed for the AWK command.

Thanks.
 

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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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