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Full Discussion: grep the number of first occurence
Top Forums UNIX for Dummies Questions & Answers grep the number of first occurence Post 302213810 by neruppu on Friday 11th of July 2008 04:54:26 AM
Old 07-11-2008
Quote:
Originally Posted by thestevew
Lots of things here:
the second 'grep' is looking for "OMC OMC LS" - you've got OMC followed by $omc_ident, which is set to "OMC LA" or something similar. Unfortunately, you've enclosed this in single quotes so what it is actually looking for is "OMC $omc_ident$" - variables aren't expanded inside single quotes. Also, grep -n prints the line number and line for each match, not the number of occurrences, use "grep -c" for a count. Then, why awk?

Try:
omc_num=`grep -c "^${omc_ident}$" File1.txt`

For one-liners like this it's easier to build them up gradually then multiple errors don't disguise each other -then look at simplifying.
if you'd tried
grep '^OMC' File1.txt and looked at the output
then
grep '^OMC' File1.txt| grep -n '^OMC $omc_ident$' and seen no output
then you would have improved your chances of solving the problem.
And read the man pages!
cheers
Steve

Thanks for explanation but yet it didnt solve my problem steve.....
grep '^OMC' File1.txt| grep -n '^OMC $omc_ident$' is return null as ur comment..
Pls let me know if there is any possible solution for this....
Last edited by neruppu; 07-11-2008 at 06:00 AM..
 

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LEARN ABOUT POSIX

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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