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Full Discussion: Monitor log file
Top Forums Shell Programming and Scripting Monitor log file Post 302639933 by Chubler_XL on Sunday 13th of May 2012 07:39:09 PM
Old 05-13-2012
You could use awk to only look for new occurances of string within log:

(first line creates logfile if none exists - this simplifies rest of code as we can ignore file not existing case).

Code:
[ -f logfile ] || > logfile
LN=$(wc -l < logfile)
stop weblogin &
CHILD=$!
 
while [ -d /proc/$CHILD ] && awk "NR>$LN && /unable to stop weblogin/{exit 1}" logfile
do
   sleep 1
done
[ -d /proc/$CHILD ] && ! awk "NR>$LN && /unable to stop weblogin/{exit 1}" logfile && kill $CHILD


Last edited by Chubler_XL; 05-13-2012 at 08:50 PM..
This User Gave Thanks to Chubler_XL For This Post:
 

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LOGSAVE(8)                                                    System Manager's Manual                                                   LOGSAVE(8)

NAME
logsave - save the output of a command in a logfile SYNOPSIS
logsave [ -asv ] logfile cmd_prog [ ... ] DESCRIPTION
The logsave program will execute cmd_prog with the specified argument(s), and save a copy of its output to logfile. If the containing directory for logfile does not exist, logsave will accumulate the output in memory until it can be written out. A copy of the output will also be written to standard output. If cmd_prog is a single hyphen ('-'), then instead of executing a program, logsave will take its input from standard input and save it in logfile logsave is useful for saving the output of initial boot scripts until the /var partition is mounted, so the output can be written to /var/log. OPTIONS
-a This option will cause the output to be appended to logfile, instead of replacing its current contents. -s This option will cause logsave to skip writing to the log file text which is bracketed with a control-A (ASCII 001 or Start of Header) and control-B (ASCII 002 or Start of Text). This allows progress bar information to be visible to the user on the console, while not being written to the log file. -v This option will make logsave to be more verbose in its output to the user. AUTHOR
Theodore Ts'o (tytso@mit.edu) SEE ALSO
fsck(8) E2fsprogs version 1.44.1 March 2018 LOGSAVE(8)
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