請解釋 ps -ef 命令的輸出？

該命令的部分輸出ps -ef如下所示：

UID        PID  PPID  C STIME TTY          TIME CMD
root         1     0  0  2012 ?        00:00:01 init [3]         
root         2     1  0  2012 ?        00:00:01 [migration/0]
root         3     1  0  2012 ?        00:00:00 [ksoftirqd/0]
root         4     1  0  2012 ?        00:00:00 [watchdog/0]
root         5     1  0  2012 ?        00:00:00 [events/0]
root         6     1  0  2012 ?        00:00:00 [khelper]
root         7     1  0  2012 ?        00:00:00 [kthread]
root         9     7  0  2012 ?        00:00:00 [xenwatch]
root        10     7  0  2012 ?        00:00:00 [xenbus]
root        18     7  0  2012 ?        00:00:01 [migration/1]
root        19     7  0  2012 ?        00:00:00 [ksoftirqd/1]

"?"TTY 列中所有行的 是什麼意思？ C和CMDcolumn 代表什麼？

您可以查看手冊頁man ps以了解這些列的含義。ps例如，Linux聯機幫助頁給出：

c              C           integer value of the processor utilisation percentage.
                          (see %cpu)
tname          TTY         controlling tty (terminal). (alias tt, tty).
args           COMMAND     command with all its arguments as a string. May chop as
                          desired. Modifications to the arguments are not shown.
                          The output in this column may contain spaces.
                          (alias cmd, command)
cmd            CMD         see args. (alias args, command)

如果TTY是?，則表示該程序未與任何使用者終端關聯。

引用自：https://unix.stackexchange.com/questions/62182