使用 sudo 不輸入密碼

增加可以 reboot 的 myuser

$ sudo deluser myuser

$ adduser myuser

$ sudo gpasswd -a myuser sudo

$ echo "myuser ALL = NOPASSWD: /usr/sbin/reboot" | sudo tee /etc/sudoers.d/60_myuser

$ sudo chmod 0440 /etc/sudoers.d/60_myuser

若不幸輸入錯字，會產生如下錯誤

>>> /etc/sudoers: syntax error near line 24 <<<

sudo: parse error in /etc/sudoers near line 24

sudo: no valid sudoers sources found, quitting

sudo: unable to initialize policy plugin

使用下列方法修復

$ pkexec visudo

What now? 會停在此處，別怕按下 Enter

Options are:

  (e)dit sudoers file again

  e(x)it without saving changes to sudoers file

  (Q)uit and save changes to sudoers file (DANGER!)

使用 ssh 不用輸入密碼

hostA$ ssh-keygen

hostA$ ssh-copy-id "user@hostB -p 22"

hostA$ ssh user@hostB "command.sh arg1 arg2"