FreeKB - Linux Commands ps command - show all running processes (-e -A ax)
Linux Commands - ps command - show all running processes (-e -A ax)

There are many processes that do not run in a shell. For example, the init or systemd or upstart daemon does not run in a users shell, which is why a ? is displayed under the TTY column in the following example. The -A or -e or ax option can be used to view all processes.

[john.doe@server1 ]# ps -e
 PID  TTY        TIME  CMD
   1  ?      00:00:02  systemd
   2  ?      00:00:00  kthreadd
   3  ?      00:00:01  ksoftirqd/0
   . . .


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