Linux根据进程名称获取pid的方法

朴灿烈づ我的快乐病毒、 2023-06-15 09:55 16阅读 0赞

### 以下通过两种方法来根据进程名称获取pid ###

### 方法一 ###

最简单的方法是使用 **pidof **命令

用法：pidof  process\_name

示例

![20191121200022869.png][]

官网的详细用法如下：

NAME
           pidof -- find the process ID of a running program.
    
    SYNOPSIS
           pidof [-s] [-c] [-n] [-x] [-m] [-o omitpid[,omitpid..]]  [-o omitpid[,omitpid..]..]  program [program..]
    
    DESCRIPTION
           Pidof finds the process id's (pids) of the named programs. It prints those id's on the standard output. This program is on some systems used in run-level change scripts, especially when
           the system has a System-V like rc structure. In that case these scripts are located in /etc/rc?.d, where ? is the runlevel. If the system has a start-stop-daemon (8) program that should
           be used instead.
    
    OPTIONS
           -s     Single shot - this instructs the program to only return one pid.
    
           -c     Only  return  process ids that are running with the same root directory.  This option is ignored for non-root users, as they will be unable to check the current root directory of
                  processes they do not own.
    
           -n     Avoid stat(2) system function call on all binaries which are located on network based file systems like NFS.  Instead of using this option the the variable PIDOF_NETFS may be set
                  and exported.
    
           -x     Scripts too - this causes the program to also return process id's of shells running the named scripts.
    
           -o omitpid
                  Tells  pidof  to omit processes with that process id. The special pid %PPID can be used to name the parent process of the pidof program, in other words the calling shell or shell
                  script.
    
           -m     When used with -o, will also omit any processes that have the same argv[0] and argv[1] as any explicitly omitted process ids. This can be used to  avoid  multiple  shell  scripts
                  concurrently calling pidof returning each other's pids.
    
    EXIT STATUS
           0      At least one program was found with the requested name.
    
           1      No program was found with the requested name.
    
    NOTES
           pidof is actually the same program as killall5; the program behaves according to the name under which it is called.
    
           When pidof is invoked with a full pathname to the program it should find the pid of, it is reasonably safe. Otherwise it is possible that it returns pids of running programs that happen
           to have the same name as the program you're after but are actually other programs. Note that that the executable name of running processes is calculated with  readlink(2),  so  symbolic
           links to executables will also match.

### 方法二 ###

可以使用**ps**命令

ps -fC process\_name

![20191121200151484.png][]

过滤出pid

ps -fC process\_name | sed '1d' | awk '\{print $2\}'

![20191121200138957.png][]

一个简单的脚本测试一下一上两种方法【脚本名称：pid.sh】

#!/bin/bash
    
    
    if [ $# -ne 1 ]
    then
            echo "Usage : sh pid.sh  process_name"
            exit 1
    fi
    
    PID=`pidof $1`
    
    if [ -n "$PID" ]
    then
            echo "$1 pid is $PID"
    else
            echo "$1 process is not running!"
    fi
    
    
    echo "======================================="
    
    
    PID=`ps -fC $1 | sed '1d' | awk '{print $2}'`
    
    if [ -n "$PID" ]
    then
            echo "$1 pid is $PID"
    else
            echo "$1 process is not running!"
    fi
    
    exit 0

sh pid.sh mysqld

![20191121200554564.png][]

[20191121200022869.png]: https://img-blog.csdnimg.cn/20191121200022869.png
[20191121200151484.png]: https://img-blog.csdnimg.cn/20191121200151484.png
[20191121200138957.png]: https://img-blog.csdnimg.cn/20191121200138957.png
[20191121200554564.png]: https://img-blog.csdnimg.cn/20191121200554564.png