Quick Tip: Add users to a group with augeas
When you use Augeas to add users to groups, you might
do that by first adding a new user node to the corresponding group (we’ll
use kvm for the sake of this example), and then set its value to the name
of the user:
augtool> ins user after /files/etc/group/kvm/user[last()]
augtool> set /files/etc/group/kvm/user[last()] joe
That works great for groups that already contain at least one user. If
there are no users in the group yet, the ins will fail since there is no
match for /files/etc/group/kvm/user[last()].
Instead of saying ‘add a new user after the last user’, you need to say
‘add a new user either after the gid field or after the last user’, which
turns the above ins command to
augtool> ins user after /files/etc/group/kvm/*[self::gid or self::user][last()]
augtool> set /files/etc/group/kvm/user[last()] joe
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