安道生練功房 - 分享經驗，累積智慧

如果不想刪除帳號，暫時性不讓某個使用者使用系統，可將該帳號鎖定，指令如下:
passwd -l username
參數說明如下：

-l     This  option  is  used  to  lock the specified account and it is

              available to root only. The locking is  performed  by  rendering

              the  encrypted password into an invalid string (by prefixing the

              encrypted string with an !).

要恢復（解除鎖定）則用：
passwd -u username
參數說明如下：

-u     This  is  the  reverse  of  the  -l  option - it will unlock the

              account password by removing the ! prefix. This option is avail-

              able  to  root  only.  By default passwd will refuse to create a

              passwordless account (it will not unlock  an  account  that  has

              only  "!" as a password). The force option -f will override this

              protection.

參考資料：
http://nmc.nchu.edu.tw/linux/User_mng.htm