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.
......
後來在網上查找了相關資料，具體解決方法如下：
1、用su － 登入root模式
2、改變文件sudoers的權限為可寫:chmod 740 /etc/sudoers
3、用vi打開sudoers文件:vi /etc/sudoers
4、在root ALL=(ALL) ALL處回車，另起一行寫上：username ALL=(ALL) ALL
5、保存退出
6、把sudoers的權限改為默認的440:chmod 440 /etc/sudoers
7、退出root到普通用戶模式，使用sudo測試，通過！
注：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
完整樣例：
# /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
