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Top Forums Shell Programming and Scripting Sorting based on the second field Post 302780769 by John K on Friday 15th of March 2013 05:16:31 AM
Old 03-15-2013
Sorting based on the second field

Oracle Enterprise Linux 6

This is my file. Two fields separated by space
Code:
$ cat testfile.txt
MARCH9 MARCH4
MARCH1 MARCH5
MARCH2 MARCH326
MARCH821 MARCH7
MARCH6 MARCH2
$
$

The following numeric sort, based on the first field's 6th character works as expected.
Code:
$
$ sort -n -k  1.6 testfile.txt
MARCH1 MARCH5
MARCH2 MARCH326
MARCH6 MARCH2
MARCH9 MARCH4
MARCH821 MARCH7
$

But the following attempt to sort the lines based on the second field's numeric character doesn't seem to work.
--- In the below example for "-k 2.6" , 2 denotes second field, 6 denotes the character based on which sort should happen (I have a numeric sort here)
Code:
$
$ sort -n -k  2.6 testfile.txt
MARCH1 MARCH5
MARCH2 MARCH326
MARCH6 MARCH2
MARCH821 MARCH7
MARCH9 MARCH4

 

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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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