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Full Discussion: "group by" using shell script?
Top Forums Shell Programming and Scripting "group by" using shell script? Post 302422069 by fpmurphy on Monday 17th of May 2010 10:59:21 AM
Old 05-17-2010
Jaduks awk solution does not sort the output as requested by the OP. This can be remedied by piping the output to sort.

You can do it completely within a shell. For example using ksh93 the following script
Code:
#!/bin/ksh93

typeset -A count

# create an associative array
while read ip
do
    (( count[$ip]++ ))
done < infile


# sort print the associative array
while (( 1 ))
do
   (( !${#count[@]} )) && break;
   k=(${!count[@]})
   for j in ${!count[@]}
   do
      (( ${count[$j]} > ${count[$k]} )) && k=$j
   done
   echo "$k : ${count[$k]}"
   unset count[$k]
done

and produces the following sorted list
Code:
192.168.1.10 : 3
192.168.1.15 : 2
192.168.1.20 : 1
192.168.1.11 : 1
192.168.1.22 : 1

Associate arrays are also supported in bash V4 but use a slightly different syntax.
Last edited by fpmurphy; 05-17-2010 at 03:24 PM..
 

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LEARN ABOUT SUSE

aggregate-ios

AGGREGATE-IOS(1)                                              General Commands Manual                                             AGGREGATE-IOS(1)

NAME

       aggregate-ios - optimise a concatenated set of cisco/IOS prefix filters to help make them nice and short.

SYNOPSIS

       aggregate-ios <source_config >optimised_config

DESCRIPTION

       Takes  cisco IOS configuration on stdin, and optimises any prefix filters found using aggregate(1).  Optimised filters are produced on std-
       out.

OPTIONS

       None.

DIAGNOSTICS

       Any diagnostics produced by aggregate(1) are passed through on stderr.

EXAMPLES

       The following configuration fragment:

         ip prefix-list AS65530 description Foo, Inc
         ip prefix-list AS65530 permit 10.1.0.0/16
         ip prefix-list AS65530 permit 10.2.0.0/16
         ip prefix-list AS65530 permit 10.2.1.0/24
         ip prefix-list AS65530 permit 10.3.0.0/16
         ip prefix-list AS65531 description Bar.Com
         ip prefix-list AS65531 seq 5 permit 192.168.1.0/24
         ip prefix-list AS65531 seq 10 permit 192.168.2.0/24
         ip prefix-list AS65531 seq 15 permit 192.168.0.0/19

       is optimised as follows:

         ip prefix-list AS65530 permit 10.1.0.0/16 le 24
         ip prefix-list AS65530 permit 10.2.0.0/15 le 24
         ip prefix-list AS65531 permit 192.168.0.0/19 le 24

SEE ALSO

       aggregate(1)

HISTORY

       Aggregate-ios was written by Joe Abley <jabley@mfnx.net>.

BUGS

       All those in aggregate(1) and then some :)

Joe Abley                                                        2000 November 27                                                 AGGREGATE-IOS(1)
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