几个常用的ps命令

1. ps aux

If you are looking for a short summary of the active processes, use  ps aux

[root@rhel7 tmp]# ps aux |head
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root           0.0  0.3     ?        Ss   Jun27   : /usr/lib/systemd/systemd --switched-root --system --deserialize
root           0.0  0.0            ?        S    Jun27   : [kthreadd]
root           0.0  0.0            ?        S    Jun27   : [ksoftirqd/]
root           0.0  0.0            ?        S    Jun27   : [migration/]
root           0.0  0.0            ?        S    Jun27   : [rcu_bh]
root           0.0  0.0            ?        S    Jun27   : [rcuob/]
root          0.0  0.0            ?        R    Jun27   : [rcu_sched]
root          0.0  0.0            ?        S    Jun27   : [rcuos/]
root          0.0  0.0            ?        S    Jun27   : [watchdog/]

2. ps -ef 

If you are not only looking for the name of the process but also for the exact command that was used to start the process, use ps -ef .

[root@rhel7 tmp]# ps -ef |head
UID        PID  PPID  C STIME TTY          TIME CMD
root                 Jun27 ?        :: /usr/lib/systemd/systemd --switched-root --system --deserialize
root                 Jun27 ?        :: [kthreadd]
root                 Jun27 ?        :: [ksoftirqd/]
root                 Jun27 ?        :: [migration/]
root                 Jun27 ?        :: [rcu_bh]
root                 Jun27 ?        :: [rcuob/]
root                Jun27 ?        :: [rcu_sched]
root                Jun27 ?        :: [rcuos/]
root                Jun27 ?        :: [watchdog/]

3.ps fax

which shows hierarchical relationships between parent and child processes.

[root@rhel7 tmp]# ps fax | head
  PID TTY      STAT   TIME COMMAND
     ?        S      : [kthreadd]
     ?        S      :  \_ [ksoftirqd/]
     ?        S      :  \_ [migration/]
     ?        S      :  \_ [rcu_bh]
     ?        S      :  \_ [rcuob/]
    ?        R      :  \_ [rcu_sched]
    ?        S      :  \_ [rcuos/]
    ?        S      :  \_ [watchdog/]
    ?        S<     :  \_ [khelper]