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Full Discussion: How to break a loop if condition is met
Top Forums Shell Programming and Scripting How to break a loop if condition is met Post 302334195 by kshji on Wednesday 15th of July 2009 03:59:41 AM
Old 07-15-2009
Code:
while true
do
   f=$( grep 'END OF STATUS REPORT' filename  2>/dev/null )
   # f include data if grep return some string = find something
   # f is empty string if not find 
   # ofcourse you can test exit status: 0=found, != 0  =not
   if [ "$f" != "" ]
   then
           echo Condition match
           break
   fi
   echo condition not met still searching
   sleep 1  # if not so hurry to check under 1 sec, then sleep 1 = system friendly
done

echo Condition met and command to execute

So shortly same result, output is not interesting, only result of grep
Code:
while true
do
   if grep 'END OF STATUS REPORT' filename  >/dev/null  2>&1
   then
           echo Condition match
           break
   fi
   echo condition not met still searching
   sleep 1  
done

 

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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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