shell脚本，锁机制

[root@localhost wyb]# cat suijizhi.sh 
#!/bin/bash

a=`ps -ef|grep $0|grep -v grep |wc -l`
echo "$a"
[ $a -ne 2 ] && echo "123" && exit 1

for i in `seq 10`
do

   sleep 1000
done

[root@localhost wyb]#