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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.

2 Answers 2

46
getent group somegroupname || groupadd somegroupname
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  • 4
    Thanks. In case it helps anyone, this slight modification avoids printing output from the first command: [ $(getent group somegroupname) ] || groupadd somegroupname Jul 18, 2014 at 20:06
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    Or just redirect it's output to /dev/null Jul 18, 2014 at 20:11
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With force it exits successfully if the group already exists, and cancels -g if the GID is already used.

groupadd -f somegroupname

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