![]() No problem! I tend to forget these instructions myself for other systems. Tip: You could bind this as a keyboard shortcut or execute it from within a script and not have to worry of an invisible password prompt. So, let’s say you wish to restart your system without entering a password: Since it’s still a privileged command, you still need to have sudo at the start of the command. You will see a confirmation if your changes have been successfully saved. Here’s an example for shutdown for the user john: ![]() Replace /path/to/executable with the full path to the command as we found out in step 1.If you forgot who you are, see the lowercase name of home folder or type whoami.Replace username with your actual username.Username ALL=NOPASSWD: /path/to/executable It will be executed at the end of sudoers.Īn advantage of saving to /etc/sudoers.d is that it’s easier to preserve copies if you perform a clean installation or if visudo is overwritten later (for instance, due to an upgrade).ģ) At the bottom of the file, add the following: Where your_filename is the name of your file. Sudo visudo -f /etc/sudoers.d/your_filename (See visudo comments for details: sudo visudo) Instead, you should create your own individual file, thanks to this tip by you want to avoid changing the sudoers file, you can create your own file instead. Thankfully, if you do make a mistake after you save, visudo will not proceed. This is a very important safety measure, because if your sudoers file is invalid, you will lose access to sudo on your system. This is a utility that allows you to properly edit the sudoers file. Use the command which to print its path.įor example, the shutdown command is at /sbin/shutdown: Some commands like shutdown and pm-suspend may just add convenience for your workflow.ġ) First, we need to find out the path of the executable. Some commands could cause damage or put your system at risk if accidentally executed incorrectly. This tip will step through how to exempt the command from the password prompt from sudo like this prompt:īe cautious with which programs you wish to exempt from having to enter the password. "John T"'s comment should also include the "-k" parameter, as if you run "sudo -S" without "-k" and sudo authentication cache already has your credentials (and is still valid, default sudo authentication cache is 5 minutes) then bash will run your password as a command instead, which is bad.Sometimes, you may wish to run a command but you wouldn’t want to pester the almighty super user (root / sudo) for the password. Setting "echo "" | sudo -S -v" to a variable instead might also be a good idea, then just run the variable before each command that needs root privileges, see Janar's comment. However, I'm thinking using this for scripting purposes, so I'll keep it at the top of all my scripts for best security practices. You could also put "export HISTIGNORE=' sudo -S'" in your ~/.bashrc file, then load it with ". Yes, whoami shouldn't take 5 minutes, but I figure might as well have it run before each command for consistency. Note I ran a sudo before each command to ensure that the sudo cache is updated, as the default is 5 mintues. ![]() But the downside of this is that you'll need to be aware of the 5 minute cache.įor example: $ export HISTIGNORE='*sudo -S*' Another method is to update the sudo authentication credential cache (default is enabled with 5 minutes timeout), then run the sudo separately. ![]() The downside to the above method is that if you want to see the commands you ran in the history later on they won't be there. $ echo "" | sudo -S -k bash /tmp/myscript.sh “-k” means to ignore cached credentials to force sudo “-S”, means to use stdin for the password, That is the history in memory or "~/.bash_history" file.įor example, the below will safely pipe your password to the sudo command, without "HISTIGNORE" means to not save this command into the history. Then pass your password safely to sudo: $ echo "your_password" | sudo -S -k Set HISTIGNORE to " sudo -S" $ export HISTIGNORE='*sudo -S*' ![]()
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