ps命令詳解-ps aux與ps -ef區別
阿新 • • 發佈：2019-02-14
D 不可中斷 uninterruptible sleep (usually IO)
R 執行 runnable (on run queue)
S 中斷 sleeping
T 停止 traced or stopped
Z 僵死 a defunct (”zombie”) process
這裡重點討論的是ps aux和ps –aux的區別，及ps aux和ps –ef的區別。
1. ps aux和ps –aux
man ps 之後得到的結果：
ps displays information about a selection of the active processes. If you want a repetitive update of the selection and the displayed information, use top(1) instead.
Note that "ps -aux" is distinct from "ps aux". The POSIX and UNIX standards require that "ps -aux" print all processes owned by a user named "x", as well as printing all processes that would be selected by the -a option. If the user named "x" does not exist, this ps may interpret the command as "ps aux" instead and print a warning.
This behavior is intended to aid in transitioning old scripts and habits. It is fragile, subject to change, and thus should not be relied upon.
意思是：
請注意"ps -aux"不同於"ps aux"。POSIX和UNIX的標準要求"ps -aux"列印使用者名稱為"x"的使用者的所有程序，以及列印所有將由-a選項選擇的過程。如果使用者名稱為"x"不存在，ps的將會解釋為"ps aux"，而且會列印一個警告。這種行為是為了幫助轉換舊指令碼和習慣。它是脆弱的，即將更改，因此不應依賴。
如果你執行ps -aux >/dev/null，那麼你就會得到下面這行警告資訊
Warning: bad ps syntax, perhaps a bogus '-'? See http://procps.sf.net/faq.html
綜上： 使用時兩者之間直接選擇ps aux
2. ps aux 和ps -ef
兩者的輸出結果差別不大，但展示風格不同。aux是BSD風格，-ef是System V風格。這是次要的區別，一個影響使用的區別是aux會截斷command列，而-ef不會。當結合grep時這種區別會影響到結果。
R 執行 runnable (on run queue)
S 中斷 sleeping
T 停止 traced or stopped
Z 僵死 a defunct (”zombie”) process
這裡重點討論的是ps aux和ps –aux的區別，及ps aux和ps –ef的區別。
1. ps aux和ps –aux
man ps 之後得到的結果：
ps displays information about a selection of the active processes. If you want a repetitive update of the selection and the displayed information, use top(1) instead.
Note that "ps -aux" is distinct from "ps aux". The POSIX and UNIX standards require that "ps -aux" print all processes owned by a user named "x", as well as printing all processes that would be selected by the -a option. If the user named "x" does not exist, this ps may interpret the command as "ps aux" instead and print a warning.
This behavior is intended to aid in transitioning old scripts and habits. It is fragile, subject to change, and thus should not be relied upon.
意思是：
請注意"ps -aux"不同於"ps aux"。POSIX和UNIX的標準要求"ps -aux"列印使用者名稱為"x"的使用者的所有程序，以及列印所有將由-a選項選擇的過程。如果使用者名稱為"x"不存在，ps的將會解釋為"ps aux"，而且會列印一個警告。這種行為是為了幫助轉換舊指令碼和習慣。它是脆弱的，即將更改，因此不應依賴。
如果你執行ps -aux >/dev/null，那麼你就會得到下面這行警告資訊
Warning: bad ps syntax, perhaps a bogus '-'? See http://procps.sf.net/faq.html
綜上： 使用時兩者之間直接選擇ps aux
2. ps aux 和ps -ef
兩者的輸出結果差別不大，但展示風格不同。aux是BSD風格，-ef是System V風格。這是次要的區別，一個影響使用的區別是aux會截斷command列，而-ef不會。當結合grep時這種區別會影響到結果。