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Is it a bad practice to run a command which requires sudo in ~/.profile?

If really want to do that, how can I make the command run at rebooting Ubuntu?

  • make the command running with sudo and under my user account not require password, by editing /etc/sudoers?

  • provide my password in the command with sudo in ~/.profile, by echo <passwd> | sudo -S <mycommand>?

I haven't verified if the first way works, because I am still learning how to do it.

The second way seems to raise serious security concern, and probably the least way I want to go.

Thanks.

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If you put the command in your ~/.profile, it will run every time you launch a login shell. Some terminal emulators allow you to use a login shell for each terminal window. Do you want your command running that often?

If you want to be allowed to use sudo for that command without entering a password, use the visudo command with sudo visudo (or, to use your favourite editor, use sudo -E visudo).
DO NOT EDIT /etc/sudoers DIRECTLY.

Add a line like this:

tim  ALL=(ALL) NOPASSWD: /path/to/my/command

The order is important in the sudoers file, so add it below this line: root ALL=(ALL:ALL) ALL

However, if you only want it to run when your system starts up, add it to /etc/rc.local and you don't have to worry about sudo.

  • Thanks! Curious why "DO NOT EDIT /etc/sudoers DIRECTLY"? How differently does visudo work from editing the file directly? – Tim Apr 1 '18 at 14:36
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    @Tim From man visudo: "visudo locks the sudoers file against multiple simultaneous edits, provides basic sanity checks, and checks for parse errors.". You definitively do not want /etc/sudoers get corrupted, recovering from such a situation is a hassle. – nohillside Apr 1 '18 at 14:38
  • @patrix Thanks. I am probably not going to try the dangerous sudoers way. May I still ask about it? If the command I want to run in ~/.profile is a bash script which contains a command which needs root privillege, do I need to add both the script and the command in it to /etc/sudoers, or just the script? – Tim Apr 1 '18 at 15:03
  • Just the script. Once you launch the script with elevated privs, commands called from it have the same privs. – glenn jackman Apr 1 '18 at 15:25
  • But, how often do you need to run this command? Once at startup or every login shell? – glenn jackman Apr 1 '18 at 15:25

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