shell後臺daemon指令碼
阿新 • • 發佈：2018-12-13
有些指令碼，可能防止重複啟動，處於後臺daemon狀態,用鎖檔案來監控保持daemon狀態
#!/bin/bash
#指定鎖檔案=========
lockfile=/test/lock.txt
#檢測鎖檔案,避免重複啟動========
function check()
{
#==============kill -0不傳送訊號，判斷程序是否存在，返回1/0
if [ -e $lockfile ] && kill -0 cat ${lockfile};
then
echo “process is already running!!”
exit
fi
trap “rm -f ${lockfile};exit” INT TERM EXIT
}
#======監控lockfile =
monitor_lockfile()
{
if [ ! -e $lockfile ]
then
echo “process has stoped,because lockfile has been delete”
exit
fi
}
#=======main方法
function work()
{
check
echo $$ > ${lockfile}
while true
do
monitor_lockfile
echo “working !! ===>”
sleep 2
done
}
work