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Full Discussion: awk help - matching a field with certail values
Top Forums Shell Programming and Scripting awk help - matching a field with certail values Post 302803331 by Don Cragun on Monday 6th of May 2013 12:07:15 PM
Old 05-06-2013
Quote:
Originally Posted by juzz4fun
Hello there,

I have a file with few fields separated by ":". I wrote a below awk to manipulate this file:

awk 'BEGIN { FS=OFS=":" }\
NR != 1 && $2 !~ /^98/ && $8 !~ /^6[12][01][0]/{print $0}' $in_file > $out_file

What I wanted was that if $8 field contains any of the values - 6100, 6110, 6200 - it should not be processed. But above pattern will match to 6210 as well and will reject it. What modification should I make in order for pattern not to select 6210 and all 6210s appear in the output?

regards,
juzz4fun
Code:
awk 'BEGIN { FS=OFS=":" }
NR != 1 && $2 !~ /^98/ && $8 !~ /^6(10|11|20)0/' $in_file > $out_file

will copy lines from $infile to output if and only if:
  1. it is not the 1st line of the file,
  2. the second field in the file does not start with "98", and
  3. the eighth field in the file does not start with 6100, 6110, or 6200.
Note that item #3 in the list says "start with" (which is what your code was doing), but your English description said "contains". If you want "contains" instead of "starts with", change /^6(10|11|20)0/ to /6(10|11|20)0/. If you want "is" instead of "starts with" or "contains", change $8 !~ /^6(10|11|20)0/ to $8 != /6(10|11|20)0/.
 

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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)
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