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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

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Run command as not-root (social.vivaldi.net)

submitted 1 year ago by nirogu@social.vivaldi.net to c/linux@lemmy.ml

30 comments fedilink hide all child comments

Run command as not-root

Hi everyone

At work, I have to run a command in an AWS instance. In that particular instance only exists the root user. The command should not be executed with root privileges (it executes mpirun, which is not recommended to run as sudo or the machine might break), so I was wondering if there is a way to block or disable the sudo privileges while the command is running. As mentioned, the only user existing there is root, so I suppose "sudo -u" is not an option.

Does anyone know how to do it? Thanks in advance!

@linux

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[–] Oisteink@feddit.nl 3 points 1 year ago* (last edited 1 year ago)

Linux privilege only understands user id’s and group id’s. These are mapped through /etc/passwd and /etc/groups. You will see in passwd that the root user has UID 0. Any account you create with UID 0 will have root privileges. So running the command specifying any user with UID!=0 will run without those privileges.

It’s also possible to set user on execution with setuid - but that won’t work on scripts only binary executables.

https://en.wikipedia.org/wiki/Setuid

https://en.wikipedia.org/wiki/User_identifier

https://en.wikipedia.org/wiki/Group_identifier