检查过程中使用Shell脚本(Check Process using Shell Script)

我正在开发一个Java程序，检查正在运行的进程，如果没有启动这一进程。 在我的背景，我执行.SH文件，该文件是这样的。

#!/bin/sh
echo "Hello World..."
cnt=`ps -eaflc --sort stime | grep clientApplication.jar | grep -v grep | wc -l`
if [ $cnt = 3 ] 
then
        echo "Services for Pigeon are already running..."
else
        echo "Starting Services for Pigeon..."
        echo `java -jar clientApplication.jar`
fi

但它不工作。 有什么问题？

Answer 1:

使用测试表达的作品。 希望这可以帮助 ！！

echo "Hello World"
cnt=`ps -eaflc --sort stime | grep clientApplication.jar |grep -v grep | wc -l`
if(test $cnt -eq 3) ;
then
    echo "Services for Pigeon are already running..."
else
    echo "Starting Services for Pigeon..."
    echo `java -jar clientApplication.jar`
fi

Answer 2:

我不确定。 尝试这个

cnt=$(`ps -eaflc --sort stime | grep clientApplication.jar | grep -v grep | wc -l`)
if[$cnt -eq 3]; then

刚刚尝试这一点

Answer 3:

echo won't execute anything it will just print the content what is there in double quotes. So if i have understood your requirement you should be doing this instead of

回声的“Hello World” CNT = ps -eaflc --sort stime | grep clientApplication.jar |grep -v grep | wc -l ps -eaflc --sort stime | grep clientApplication.jar |grep -v grep | wc -l ps -eaflc --sort stime | grep clientApplication.jar |grep -v grep | wc -l如果（测试$ CNT -eq 3）; 然后回声“的鸽子服务已经运行...”其他回声“启动服务的鸽子......” /bin/java -jar clientApplication.jar网络

Hope this will work, i haven't tested it now

Answer 4:

1. 相等检查应==，=是分配
2. 我会使用$（表达式），而不是`expr`
3. 如果（表达式）不如果[expr]
4. 如果你打算呼应的java线与否不能确定，它不会告诉它打印开始罐子。 既然你说你想要启动它我摆脱了回声。

所以如果你试试这个，它的工作：

    #!/bin/sh
    echo "Hello World..."
    cnt=$(ps -eaflc --sort stime | grep clientApplication.jar | grep -v grep | wc -l)
    if($cnt==3) 
    then
        echo "Services for Pigeon are already running..."
    else
        echo "Starting Services for Pigeon..."
        java -jar clientApplication.jar
    fi

文章来源: Check Process using Shell Script