进程锁

[root@aliyun ~]# cat lock.sh 
#!/bin/bash
lock_file=/tmp/echo1.lock

#判断进程是否正在运行
if [ -f $lock_file ];then
	pid=`cat $lock_file`
	ps $pid &>/dev/null
	[ $? -eq 0 ] && echo "Script1 is running..." && exit 1
	#if [ $? -eq 0 ];then
	#	echo "Script1 is running..."
	#	exit 1
	#fi
fi

#创建锁
echo $$ > $lock_file

echo "lock1 begin..."
sleep 500
echo "lock1 end"

#释放锁
rm -rf $lock_file