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Full Discussion: Pattern Matchin Huge File
Top Forums Shell Programming and Scripting Pattern Matchin Huge File Post 302495388 by Scrutinizer on Thursday 10th of February 2011 05:07:19 AM
Old 02-10-2011
Perhaps this will go faster:
Code:
grep '^.\{154\}31' infile > 31.txt

To just count the records:
Code:
grep -c '^.\{154\}31' infile

Likewise for 39
This User Gave Thanks to Scrutinizer For This Post:
senthil.ak
 

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LEARN ABOUT LINUX

zegrep

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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