Short, simple command to create a group if it doesn't already exist?

Question

What is the cleanest way to modify this command in bash to only run if the group does not exist?

groupadd somegroupname

A one-liner would be best.

Solution 1

getent group somegroupname || groupadd somegroupname

Solution 2

With force it exits successfully if the group already exists, and cancels -g if the GID is already used.

groupadd -f somegroupname

Comments

[Oleg]

Thanks. In case it helps anyone, this slight modification avoids printing output from the first command: [ $(getent group somegroupname) ] || groupadd somegroupname

[Angel Todorov]

Or just redirect it's output to /dev/null