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Full Discussion: Run this grep every 10 minutes and do something based on the output
Top Forums Shell Programming and Scripting Run this grep every 10 minutes and do something based on the output Post 302929528 by rbatte1 on Monday 22nd of December 2014 12:06:23 PM
Old 12-22-2014
The redirect will stop you getting messages to standard output (the screen for an on-line session) that you may not want. You could also dispose of it with:-
Code:
while true
do
   if grep -qv Processing status.txt
   then
      echo Complete
      exit
   fi
   sleep 600
done

It is the return code (i.e. did I match the expression/string or not) that is best here, rather than my ill-considered attempt to read the file into a variable each time.



Robin
This User Gave Thanks to rbatte1 For This Post:
kraljic
 

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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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