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Full Discussion: Searching a string in a file using perl
Top Forums Shell Programming and Scripting Searching a string in a file using perl Post 302583947 by vivek_damodaran on Wednesday 21st of December 2011 06:34:24 PM
Old 12-21-2011
Searching a string in a file using perl
Hi

I would like to read a file using perl and search for a string (last entry). Then read that into an array and do further grep

File content for ex:

comp=a,value=30,runtime=12,type=lic
comp=d,value=15,runtime=2,type=lic
comp=a,value=90,runtime=43,type=lic
comp=e,value=78,runtime=45,type=lic

I would like to read this file and find out the last occurance of "comp=e" and "type=lic"

then read that into an array, which will have

comp=a,value=90,runtime=43,type=lic

I tried using ksh (tail -1), but since the file is huge and am using lot of greps its taking time to return the results.

Tried this simple perl script....

Code:
chomp($log);
foreach $comp ("a" "b")
{
        $var1=`grep \"comp=$comp\" $log | grep \"type=lic\" | tail -1 | cut -d\",\" -f2 | cut -d\"=\" -f2`;
        $var2=`grep \"comp=$comp\" $log | grep \""type=lic"\" | tail -1 | cut -d\",\" -f3 | cut -d\"=\" -f2`;
        chomp($var1);chomp($var2);
        print ("$comp,$var1,$var2");
}


but I would like to implement this using file handlers /array. I dont want to do multiple greps in that loop...instead read output of below in a array and then do the cut

Code:
grep \"comp=$comp\" $log | grep \"type=lic\" | tail -1

Can someone help? Thanks
 

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LEARN ABOUT REDHAT

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  is used to invoke the grep on compress'ed or gzip'ed files. All options specified are passed directly to grep.  If no file is speci-
       fied, 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  zgrep  is invoked as zegrep or zfgrep then egrep or fgrep is used instead of grep.  If the GREP environment variable is set, zgrep uses
       it as the grep program to be invoked. For example:

	   for sh:  GREP=fgrep	zgrep string files
	   for csh: (setenv GREP fgrep; zgrep string files)

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

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

																	  ZGREP(1)
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