Linux命令PS
$ ps -ef
root 26551 5 0 Feb10 ? 00:03:41 [pdflush]
root 26570 5 0 Feb10 ? 00:00:20 [pdflush]
root 30344 3382 0 Feb21 ? 00:00:11 sshd: root@pts/14
root 30365 30344 0 Feb21 pts/14 00:00:02 -bash
root 30393 3382 0 Feb21 ? 00:00:10 sshd: root@pts/15
Where:
-e to display all the processes.
-f to display full format listing.
2. 基于用户或运行的程序来列出进程 (ps -u, ps -C)
-u选项用来显示只属于此user的进程。多个用户时使用逗号隔开。
$ ps -f -u wwwrun,postfix
UID PID PPID C STIME TTY TIME CMD
postfix 7457 7435 0 Mar09 ? 00:00:00 qmgr -l -t fifo -u
wwwrun 7495 7491 0 Mar09 ? 00:00:00 /usr/sbin/httpd2-prefork -f /etc/apache2/httpd.conf
wwwrun 7496 7491 0 Mar09 ? 00:00:00 /usr/sbin/httpd2-prefork -f /etc/apache2/httpd.conf
wwwrun 7497 7491 0 Mar09 ? 00:00:00 /usr/sbin/httpd2-prefork -f /etc/apache2/httpd.conf
wwwrun 7498 7491 0 Mar09 ? 00:00:00 /usr/sbin/httpd2-prefork -f /etc/apache2/httpd.conf
wwwrun 7499 7491 0 Mar09 ? 00:00:00 /usr/sbin/httpd2-prefork -f /etc/apache2/httpd.conf
wwwrun 10078 7491 0 Mar09 ? 00:00:00 /usr/sbin/httpd2-prefork -f /etc/apache2/httpd.conf
wwwrun 10082 7491 0 Mar09 ? 00:00:00 /usr/sbin/httpd2-prefork -f /etc/apache2/httpd.conf
postfix 15677 7435 0 22:23 ? 00:00:00 pickup -l -t fifo -u
通常我们使用类似 “ps -aux | grep command”的命令来获得运行命令的进程，但是ps自身提供了选项-C来完成类似的任务。下列的命令显示所有进程中包含 tatad.pl的进程.
$ ps -f -C tatad.pl
UID PID PPID C STIME TTY TIME CMD
root 9576 1 0 Mar09 ? 00:00:00 /opt/tata/perl/bin/perl /opt/tata/bin/tatad.pl
root 9577 9576 0 Mar09 ? 00:00:00 /opt/tata/perl/bin/perl /opt/tata/bin/tatad.pl
root 9579 9576 0 Mar09 ? 00:00:00 /opt/tata/perl/bin/perl /opt/tata/bin/tatad.pl
root 9580 9576 0 Mar09 ? 00:00:00 /opt/tata/perl/bin/perl /opt/tata/bin/tatad.pl
root 9581 9576 0 Mar09 ? 00:00:00 /opt/tata/perl/bin/perl /opt/tata/bin/tatad.pl
root 9582 9576 0 Mar09 ? 00:00:00 /opt/tata/perl/bin/perl /opt/tata/bin/tatad.pl
root 12133 9576 0 Mar09 ? 00:00:00 /opt/tata/perl/bin/perl /opt/tata/bin/tatad.pl
Note: We can create aliases for ps command to list processes based on commands, users or groups.
3. 根据进程id或pid来列出进程
Each process will be assigned with the unique Process ID (PID).
When you launch some application, it might fork number of processes and each sub process will have its own PID. So, each process will have its own process id and parent processid.
For all the processes that a process forks will have the same PPID (parent process identifier). The following method is used to get a list of processes with a particular PPID.
$ ps -f --ppid 9576
UID PID PPID C STIME TTY TIME CMD
root 9577 9576 0 Mar09 ? 00:00:00 /opt/tata/perl/bin/perl /opt/tata/bin/tatad.pl
root 9579 9576 0 Mar09 ? 00:00:00 /opt/tata/perl/bin/perl /opt/tata/bin/tatad.pl
root 9580 9576 0 Mar09 ? 00:00:00 /opt/tata/perl/bin/perl /opt/tata/bin/tatad.pl
root 9581 9576 0 Mar09 ? 00:00:00 /opt/tata/perl/bin/perl /opt/tata/bin/tatad.pl
root 9582 9576 0 Mar09 ? 00:00:00 /opt/tata/perl/bin/perl /opt/tata/bin/tatad.pl
root 12133 9576 0 Mar09 ? 00:00:00 /opt/tata/perl/bin/perl /opt/tata/bin/tatad.pl
The following example is to list the processes which has given PID.
$ ps -f -p 25009,7258,2426
UID PID PPID C STIME TTY TIME CMD
root 2426 4 0 Mar09 ? 00:00:00 [reiserfs/0]
root 7258 1 0 Mar09 ? 00:00:00 /usr/sbin/nscd
postfix 25009 7435 0 00:02 ? 00:00:00 pickup -l -t fifo -u
4. 以树形列出进程的关系(ps –forest) 与pstree命令类似
The example below display the process Id and commands in a hierarchy. –forest is an argument to ps command which displays ASCII art of process tree. From this tree, we can identify which is the parent process and the child processes it forked in a recursive manner.
$ ps -e -o pid,args --forest
468 \_ sshd: root@pts/7
514 | \_ -bash
17484 \_ sshd: root@pts/11
17513 | \_ -bash
24004 | \_ vi ./790310__11117/journal
15513 \_ sshd: root@pts/1
15522 | \_ -bash
4280 \_ sshd: root@pts/5
4302 | \_ -bash
Note: You can also use tree and pstree command to displays process in a nice tree structure.
5. 显示进程运行的时间(ps -o pid,etime=)
If you want the get the elapsed time for the processes which are currently running ps command provides etime which provides the elapsed time since the process was started, in the form [[dd-]hh:]mm:ss.
The below command displays the elapsed time for the process IDs 1 (init) and process id 29675.
For example “10-22:13:29″ in the output represents the process init is running for 10days, 22hours,13 minutes and 29seconds. Since init process starts during the system startup, this time will be same as the output of the ‘uptime’ command.
# ps -p 1,29675 -o pid,etime=
PID
1 10-22:13:29
29675 1-02:58:46
参考：
完！
