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Full Discussion: How to make grep stop at first match
Operating Systems AIX How to make grep stop at first match Post 302409554 by mpoblete on Thursday 1st of April 2010 01:00:21 PM
Old 04-01-2010
I tried all the suggestions with the same string that should locate a record at the ~17% of the file (~record number 170,000), the best response time still goes to grep :

grep took 17 seconds, 3 to show the match the res 14 scanning the rest of the file.

Code:
grep mystring myfile

awk took 20 seconds

Code:
awk '/mystring{1}/' myfile.txt


then sed as scottn suggested took 28 seconds

tried awk as franklin52 suggested and took 18 seconds

so in summary I'm still good with grep but my users are not happy to wait once in a while for 17 seconds to get their screen back with the response (neither my server performance if I have many users using the same look up).
I would be so nice to find a way to stop grep after that first match, response time would go down to 3 seconds! I guess I'll have to find another source for grep that supports -m and see if I can install it.
 

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LEARN ABOUT ULTRIX

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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