ztail

   1 #!/bin/bash
   2 # Usage : ztail [ -n 10 ] /var/log/foo
   3 #
   4 # Implements ztail -f /var/log/foo
   5 #
   6 # License: GPLv2
   7 # Author: Martin Langhoff <martin.langhoff@gmail.com>
   8 # Copyright: Remote Learner US - http://www.remote-learner.net/
   9 #
  10 logfile=$1
  11 mydir=$(dirname "${BASH_SOURCE[0]}")
  12
  13 # flush before we get underway
  14 killall -s SIGUSR1 compresslog
  15
  16 ## setup trigger flush in a background loop
  17 (   sleep 1 # give time for the tailing to get started
  18         err=0
  19         while true ; do
  20                 killall -s SIGUSR1 compresslog 2>/dev/null
  21                 if [ $? -ne 0 ]; then
  22                         if [ $err -eq 0]; then
  23                                 echo "WARNING - ztail: compresslog is not running" >&2
  24                                 echo "WARNING - ztail:   or we are not root." >&2
  25                                 err=1
  26                         fi
  27                 fi
  28                 sleep 1
  29         done ) &
  30 FLUSHTRIGGERD=$!
  31 trap "kill $FLUSHTRIGGERD" SIGHUP SIGINT SIGTERM
  32
  33 $mydir/zcatfollow -n 10 $logfile
  34
  35 kill $FLUSHTRIGGERD