如何检查进程是否在linux中运行
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How to check if process is running in linux
提问by noMAD
I am trying to automatically check if a process is running or not and have to perform next steps accordingly. I had written a bash script but it doesn't seem to work.
我正在尝试自动检查进程是否正在运行，并且必须相应地执行后续步骤。我写了一个 bash 脚本，但它似乎不起作用。
if ps aux | grep [M]yProcessName > /dev/null
then
echo "Running"
else
echo "Not running"
fi
Is my ifstatement wrongly used?
我的if陈述是否被错误地使用？
采纳答案by Basile Starynkevitch
You don't want to know if a particular process (of known pid) is running (this can be done by testing if /proc/1234/exists for pid 1234) but if some process is running a given command (or a given executable).
您不想知道（已知 pid 的）特定进程是否正在运行（这可以通过测试/proc/1234/pid 1234是否存在来完成），但是如果某个进程正在运行给定的命令（或给定的可执行文件）。
Notice that the kill(2)syscall can be portably used to check if a given process is running (with a 0 signal, e.g. kill(pid,0)). From inside a program, this is a common way to check that a process of known pid is still existing and running (or waiting).
请注意，kill(2)系统调用可移植地用于检查给定进程是否正在运行（带有 0 信号，例如kill(pid,0)）。从程序内部，这是检查已知 pid 的进程是否仍然存在并正在运行（或等待）的常用方法。
You could use the pidofcommand to find the processes running some executable, e.g. pidof zshto find all the zshprocesses. You could also use killall -s 0 zsh
您可以使用该pidof命令查找运行某些可执行文件的进程，例如pidof zsh查找所有zsh进程。你也可以使用killall -s 0 zsh
And you might be interested by the pgreputility and the /procfilesystem.
您可能对pgrep实用程序和/proc文件系统感兴趣。
回答by Joe Yang
Using -z to check if a string is empty or not, something like this could work:
使用 -z 检查字符串是否为空，这样的事情可以工作：
line=$(ps aux | grep [M]yProcessName)
if [ -z "$line" ]
then
echo "Not Running"
else
echo $line > /dev/null
echo "Rinnung"
fi
回答by gaoxinbo
try this
尝试这个
ps aux | grep [M]yProcessName | grep -v grep
回答by Edw4rd
On my system, ps aux | grep ProcessNamealways get a line of that grep process like:
在我的系统上，ps aux | grep ProcessName总是得到一行 grep 进程，如：
edw4rd 9653 0.0 0.0 4388 832 pts/1 S+ 21:09 0:00 grep --color=auto ProcessName
So, the exit status is always 0. Maybe that's why your script doesn't work.
因此，退出状态始终为 0。也许这就是您的脚本不起作用的原因。
回答by Guest67
There is a solution:
有一个解决方案：
if [ "$(ps aux | grep "what you need" | awk '{print }')" == "grep" ]; then ... elif [ ... ]; then ... else ... fi
This works fine in Debian 6. '{print $11}' is needed, because the sytem treats grep as a process as well
这在 Debian 6 中工作正常。 '{print $11}' 是必需的，因为系统也将 grep 视为一个进程
回答by Yogeesh Seralathan
processid =$(ps aux | grep 'ProcessName' | grep -v grep| awk '{print }')
The above command will give you the process id. Assign that process id to a variable and do this -->
上面的命令会给你进程ID。将该进程 ID 分配给一个变量并执行此操作 -->
if cat /proc/$processid/status | grep "State: R (running)" > /dev/null
then
echo "Running"
else
echo "Not running"
fi
回答by begin
ps aux | grep [M]yProcessName | grep -v grep
回答by Ender Fletcher
SMBD=$(pidof smbd)
if [ "$SMBD" == "" ];
then
/etc/init.d/samba start;
else
/etc/init.d/samba restart;
fi
回答by vinllen
return 0 means success while others failed
返回 0 表示成功，其他则失败
kill -0 `pid`; echo $?
