使用Bash检查进程是否正在运行 [英] Check if a process is running using Bash

问题描述

我正在尝试使用以下代码检查进程是否正在运行:

I am trying to check if a process is running with the code below:

SERVICE="./yowsup/yowsup-cli"
RESULT=`ps aux | grep $SERVICE`

if [ "${RESULT:-null}" = null ]; then
    echo "not running"
else
    echo "running"
fi

但是它一直在回显它正在运行，尽管不是.我意识到grep本身就是结果，这就是问题所在.

But it keeps echoing it is running although it is not. I realized that the grep itself comes as a result and that is the issue.

如何跳过grep而仅检查过程?

How can I skip the grep and just check for the process?

推荐答案

使用 pgrep :

if pgrep "$SERVICE" >/dev/null 2>&1 ; then
    echo "$SERVICE is running"
fi

或更可靠的是:

if pgrep -f "/path/to/$SERVICE" >/dev/null 2>&1 ; then
    echo "$SERVICE is running"
fi

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