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Full Discussion: How to have my ksh script pause, until something appears in the logs.?
Top Forums Shell Programming and Scripting How to have my ksh script pause, until something appears in the logs.? Post 302793597 by chatguy on Friday 12th of April 2013 04:09:09 PM
Old 04-12-2013
SOLVED
Hansen,

You are a genius! At the same time, I never thought it was this easy to do this! Thank you and everyone who chimed in!!

ps: If the word DONE was not previously in the file, the variable is NULL. Turns out this is just fine, since I can compare null with 1, if the first DONE is added.

Here is the modified code I used:
Code:
LOGFILE="/tmp/tmp.log"

LAST_LINE_WITH_DONE=`grep -n DONE $LOGFILE | tail -1 | cut -d : -f 1`

print INITIAL LAST LINE IS $LAST_LINE_WITH_DONE

while sleep 5; do

  NEWLAST_LINE_WITH_DONE=`grep -n DONE $LOGFILE | tail -1 | cut -d : -f 1`
   if [[ $LAST_LINE_WITH_DONE != $NEWLAST_LINE_WITH_DONE ]]; then
     print NEW LAST LINE IS $NEWLAST_LINE_WITH_DONE
     break;
   fi
done

This User Gave Thanks to chatguy For This Post:
hanson44
 

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LEARN ABOUT BSD

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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