一、什麼是pidof命令？
複製代碼 代碼如下:
#man pidof中的解釋：
pidof — find the process ID of a running program.
pidof–用於尋找一個啟動並執行程式的PID。
pidof is actually the same program as killall5;
[root@GoGo ~]# ls -l /sbin/pidof
lrwxrwxrwx. 1 root root 8 Aug 25 00:40 /sbin/pidof -> killall5 //的確如此。
二、pidof命令的參數
-s 表示只返回1個 pid
-x 表示同時返回運行給定程式的 shell 的 pid
-o 表示告訴 piod 表示忽略後面給定的 pid ，可以使用多個 -o 。
pidof is simply a (symbolic) link to the killall5 program, which should also be located in /sbin.
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.
如果 是一個 fullpath 則 pidof 不會出錯，但如果不是則有可能返回和給定同名的程式。
三、pidof命令使用執行個體
複製代碼 代碼如下:
[root@GoGo ~]# pidof nginx
1476 1475 1473 1472 1471 1470 1469 1467 1466
[root@GoGo ~]# ps -ef | grep nginx
nginx 1450 1449 0 20:16 ? 00:00:00 php-fpm: pool www
nginx 1451 1449 0 20:16 ? 00:00:00 php-fpm: pool www
nginx 1452 1449 0 20:16 ? 00:00:00 php-fpm: pool www
nginx 1453 1449 0 20:16 ? 00:00:00 php-fpm: pool www
nginx 1454 1449 0 20:16 ? 00:00:00 php-fpm: pool www
root 1466 1 0 20:16 ? 00:00:00 nginx: master process /usr/sbin/nginx -c /etc/nginx/nginx.conf
nginx 1467 1466 0 20:16 ? 00:00:00 nginx: worker process
nginx 1469 1466 0 20:16 ? 00:00:00 nginx: worker process
nginx 1470 1466 0 20:16 ? 00:00:00 nginx: worker process
nginx 1471 1466 0 20:16 ? 00:00:00 nginx: worker process
nginx 1472 1466 0 20:16 ? 00:00:00 nginx: worker process
nginx 1473 1466 0 20:16 ? 00:00:00 nginx: worker process
nginx 1475 1466 0 20:16 ? 00:00:00 nginx: worker process
nginx 1476 1466 0 20:16 ? 00:00:00 nginx: worker process
root 2234 2141 0 20:24 pts/1 00:00:00 grep nginx
[root@GoGo ~]# ps -ef | grep nginx | awk '{print $2}'
1450
1451
1452
1453
1454
1466
1467
1469
1470
1471
1472
1473
1475
1476
2237
[root@GoGo ~]# pidof -s nginx
1476
[root@GoGo ~]# pidof sshd
2139 1163
[root@GoGo ~]# ps -ef | grep sshd
root 1163 1 0 20:16 ? 00:00:00 /usr/sbin/sshd
root 2139 1163 0 20:20 ? 00:00:00 sshd: root@pts/1
