Linux shell定時器

網上找了個例子,簡單實用如下.
可以有一個後台進程,在timer逾時採取一些操作.

 #!/bin/ksh#Delaytime=0AlarmHandler(){echo "Get SIGALAM"KillSubProcsexit 14}KillSubProcs(){#kill cbmecho "it's time out,kill cbm here"if [ $? -eq 0 ];thenecho "Sub-processes killed."fi}SetTimer(){Delaytime=$1echo $Delaytimeif [ $Delaytime  -ne 0 ];thensleep $Delaytime  && kill -s 14 $$ &#CHPROCIDS="$CHPROCIDS $!"TIMERPROC=$!fi}UnsetTimer(){echo "Start to unset timer"kill $TIMERPROC}trap AlarmHandler 14SetTimer 30#CHPROCIDS="$CHPROCIDS $!"#wait $!sleep 40UnsetTimerecho "ALL Done."exit 0