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Full Discussion: using "tail -f" in script
Top Forums UNIX for Dummies Questions & Answers using "tail -f" in script Post 302423375 by zaxxon on Friday 21st of May 2010 12:35:41 AM
Old 05-21-2010
A little shell script for the background:
Code:
$> cat logit.ksh
#!/usr/bin/ksh

LOGFILE=somefile

tail -f $LOGFILE| while read LINE; do
        echo $LINE| grep -q error && echo "`date` -- Error in [${LOGFILE}]!"| mail -s "Logfile warning!" you@bla.com
done

exit 0
$>
$> nohup ./logit.ksh &

If you want a bit more professional, check out swatch:
swatch: Automated Log Monitoring for the Vigilant but Lazy | Linux Journal
 

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TAIL(1) 						      General Commands Manual							   TAIL(1)

NAME
tail - deliver the last part of a file SYNOPSIS
tail [ +-number[lbc][rf] ] [ file ] tail [ -fr ] [ -n nlines ] [ -c ncharacters ] [ file ] DESCRIPTION
Tail copies the named file to the standard output beginning at a designated place. If no file is named, the standard input is copied. Copying begins at position +number measured from the beginning, or -number from the end of the input. Number is counted in lines, 1K blocks or characters, according to the appended flag or Default is -10l (ten ell). The further flag causes tail to print lines from the end of the file in reverse order; (follow) causes tail, after printing to the end, to keep watch and print further data as it appears. The second syntax is that promulgated by POSIX, where the numbers rather than the options are signed. EXAMPLES
tail file Print the last 10 lines of a file. tail +0f file Print a file, and continue to watch data accumulate as it grows. sed 10q file Print the first 10 lines of a file. SOURCE
/sys/src/cmd/tail.c BUGS
Tails relative to the end of the file are treasured up in a buffer, and thus are limited in length. According to custom, option +number counts lines from 1, and counts blocks and characters from 0. TAIL(1)
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