Bash脚本检查运行过程 [英] Bash script to check running process

问题描述

我写了一个bash脚本来检查进程是否正在运行.由于ps命令总是返回退出代码1，所以它不起作用.当我从命令行运行ps命令时，$?设置正确，但在脚本中始终为1.知道吗?

I wrote a bash-script to check if a process is running. It doesn't work since the ps command always returns exit code 1. When I run the ps command from the command-line, the $? is correctly set, but within the script it is always 1. Any idea?

#!/bin/bash
SERVICE=$1

ps -a | grep -v grep | grep $1 > /dev/null
result=$?
echo "exit code: ${result}"
if [ "${result}" -eq "0" ] ; then
    echo "`date`: $SERVICE service running, everything is fine"
else
    echo "`date`: $SERVICE is not running"
fi

bash版本:GNU bash，版本3.2.25(1)-发行版(x86_64-redhat-linux-gnu)

Bash version: GNU bash, version 3.2.25(1)-release (x86_64-redhat-linux-gnu)

推荐答案

有一些非常简单的方法:

There are a few really simple methods:

pgrep procname && echo Running 
pgrep procname || echo Not running 
killall -q -0 procname && echo Running 
pidof procname && echo Running

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