how to grep for string in log file

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# 1  
Old 11-22-2007
how to grep for string in log file


Im running a backup scriptwhich creates a log file

how do grep for the string in the logfile so the backup script can continue to next stage otherwise it will exit


12:32:53 INF - Client completed sending data for backup

12:33:02 INF - Backup by root on client lonbob04bak using policy Business_Objects_User, sched bus_obj_user: the requested operation was successfully completed.

so want to have something like:


[logfile | grep "the requested operation was successfully completed"]

then continue
# 2  
Old 11-22-2007
if [ `grep "the requested operation was successfully completed" ${LOGFILE}` ]
  ... all ok ...
  ... gone south ...

Off the cuff, so please test yourself. (just to be sure) Smilie

Last edited by Cameron; 11-22-2007 at 10:13 AM.. Reason: missed a '`'
# 3  
Old 11-22-2007
or maybe... u could

grep "the requested operation was successfully completed" logfile > /dev/null
if [ $? -eq 0 ]

# 4  
Old 11-22-2007


grep "the requested operation was successfully completed" $1 >/dev/null
RESULT =`echo $?`
if [ $RESULT == 0 ]; then
echo "Continue"
echo "Stop"

Assume this script file name is If your log file name is logfile, then in the command prompt give like this

$ logfile
# 5  
Old 11-22-2007
There are several approaches depending on:
- the backup script runs outside your script.
- the backup script finishes when that line is shown inside the log.
- the backup log only has (or will have) one line containing the text.
- others... Smilie
One possibility in this case:

( tail -f backup.log | while read l; do
   echo ".\c"
   echo $l | grep "the requested operation was successfully completed" > /dev/null 2>&1
   (( ! $? )) && exit 0
done ) && echo "string found, continue..."

# whatever to execute after the match, down here...

At least if you want to check the log file "on the fly"...


Last edited by grial; 11-22-2007 at 01:21 PM.. Reason: comment added
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