判断脚本是否在运行的出错

gdutllf2006

实现判断脚本是否已存在，如存在则退出，不存在则可以启动
suse linux环境下
oracle@sdp3b:> echo $SHELL
/bin/bash

vi mouses.h
#!/usr/bin/ksh
process_count=`ps -ef|grep mouse.sh|grep -v grep|wc -l`
if  [ $process_count -gt 1 ]
then
        echo "The mouse.sh is still running!"
        exit
else
        echo "The mouse.sh can be start!"
fi

chmod u+x ./mouse.sh

./mouse.sh

为什么判断不了，总是退出了，实际上没有mouse.sh脚本在运行

waker

http://bbs.chinaunix.net/thread-733138-1-1.html

cjaizss

什么都没打印吗？

gdutllf2006

看了 Waker 给的链接，还是没搞清。回到宿舍，用虚拟机测试了一把，结果却很不一样。
mouse@linux:~/temp> cat /etc/SuSE-release
SUSE Linux Enterprise Server 10 (i586)
VERSION = 10
mouse@linux:~/temp> echo $SHELL
/bin/bash

#!/usr/bin/ksh
process_count=`ps -ef|grep mouse.sh|grep -v grep|wc -l`
echo $process_count
if  [ $process_count -gt 1 ]
then
        echo "The mouse.sh is still running!"
        exit
else
        echo "The mouse.sh can be start!"
fi
mouse@linux:~/temp> ./mouse.sh
1
The mouse.sh can be start!

可以正常判断
这是怎么回事呢？

gdutllf2006

改用bash
mouse@linux:~/temp> vi mouse.sh

#!/bin/bash
process_count=`ps -ef|grep mouse.sh|grep -v grep|wc -l`
echo $process_count
if  [ $process_count -gt 1 ]
then
        echo "The mouse.sh is still running!"
        exit
else
        echo "The mouse.sh can be start!"
fi

mouse@linux:~/temp> ./mouse.sh
2
The mouse.sh is still running!

ljsdaya

回复 4# gdutllf2006

http://bbs.chinaunix.net/thread-731435-5-1.html
   46L： 终于搞定了:

procname=processctl
a=$(ps -ef)

ifrunning=`echo "$a"|grep -w $procname|grep -v grep|wc -l`

echo $ifrunning
if [ $ifrunning -gt 1 ]; then  
  echo "Alert: You can not start the process twice!"
  sleep 10
  exit
else
  echo "Start Success!"
  sleep 5
fi

定义变量解决，2l的链接里面讲的也不错。
我有个问题：
上面这一条echo "$a"|grep proc...|grep -v grep|wc -l 跟 echo "$a"|grep proc...|wc -l  是不是等价呢？ grep -v grep 这个是不是多余的呢？