I've been testing Nagios and I've found a few issues with the "check_log" plugin: 1. On log switches, it flags an error if there were any messages in the previous log; it doesn't differentiate between errors which have appeared and errors which have gone. This can be fixed by changing the line: count=`$GREP -c "$query" $tempdiff` to count=`$GREP -c "^>.*$query" $tempdiff` 2. The 'tail' command relies on GNU tail; Solaris (and other Unix) tail versions don't have long command options. Fix is to change: lastentry=`$GREP "$query" $tempdiff | $TAIL --lines=1` to lastentry=`$GREP "^>.*$query" $tempdiff | $TAIL -1` Note that we also incorporate the grep change here. 3. PATH is set to "", but the chmod isn't given a full path; change: chmod 600 $tempdiff to /bin/chmod 600 $tempdiff A diff of all these changes is: # diff check_log.bak check_log 192c192 < chmod 600 $tempdiff --- > /bin/chmod 600 $tempdiff 198c198 < count=`$GREP -c "$query" $tempdiff` --- > count=`$GREP -c "^>.*$query" $tempdiff` 201c201 < lastentry=`$GREP "$query" $tempdiff | $TAIL --lines=1` --- > lastentry=`$GREP "^>.*$query" $tempdiff | $TAIL -1` Hope these changes prove useful. John Riddoch