sudo不能使用解決

sudo不能使用解決 今天裝完系統發現我的sudo命令不能正常使用，大致情況如下:.......We trust you have received the usual lecture from the local System  Administrator. It usually boils down to these three things:       #1) Respect the privacy of others.      #2) Think before you type.      #3) With great power comes great responsibility. ......  後來在網上尋找了相關資料，具體解決方案如下：1、用su － 登入root模式2、改變檔案sudoers的許可權為可寫:chmod 740 /etc/sudoers3、用vi開啟sudoers檔案:vi /etc/sudoers4、在root ALL=(ALL) ALL處斷行符號，另起一行寫上：username ALL=(ALL) ALL5、儲存退出6、把sudoers的許可權改為預設的440:chmod 440 /etc/sudoers7、退出root到普通使用者模式，使用sudo測試，通過！註：如果想要在使用sudo時不輸入密碼，可以把4處改為:username ALL=NOPASSWD:ALL 完整範例：# /etc/sudoers # # This file MUST be edited with the 'visudo' command as root. # # See the man page for details on how to write a sudoers file. #  Defaults    env_reset  # Host alias specification  # User alias specification  # Cmnd alias specification  # User privilege specification root    ALL=(ALL) ALL #tiger   ALL=(ALL) ALL tiger   ALL=NOPASSWD:ALL  # Uncomment to allow members of group sudo to not need a password # (Note that later entries override this, so you might need to move # it further down) # %sudo ALL=NOPASSWD: ALL