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Full Discussion: Finding most repeated entry in a column and giving the count
Top Forums Shell Programming and Scripting Finding most repeated entry in a column and giving the count Post 302677277 by agama on Wednesday 25th of July 2012 11:02:29 PM
Old 07-26-2012
Given the unknown input file size, this is one case where I think awk followed by grep is approrprate:

Code:
#!/usr/bin/env ksh
what=$( awk ' { c[$2]++; if( c[$2] > max ) max = $2; } END { printf( "%s = %d\n", max, c[max] ); }'  input-file)
printf "%s\n\n" "$what"
grep ${what%% *}  input-file

Should also work in bash if you prefer
 

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LEARN ABOUT X11R4

zgrep

ZGREP(1)                                                      General Commands Manual                                                     ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep  options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

                                                                                                                                          ZGREP(1)
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