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Basil Bourque
Asked: 2018-12-03 13:47:42 +0800 CST

Get list of users in a group in FreeBSD

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How to get a list of usernames assigned to a group in FreeBSD 11.1?

This Question asks for a list of users or a list of groups.

This Question asks for users who happen to be members of multiple specific groups.

➥ But how to ask simply for a list of users currently assigned to a single specific group, such wheel?

I prefer a solution in a single command if possible. But if not feasible, a script would be useful and educational.

freebsd

4 Answers

  1. You can select users with specific group from list of all users given by pw utility:

    pw usershow -P -a | grep groupname

    Result will be something like:

    Login Name: username1     #1024         Group: groupname          #1002
Login Name: username2     #1025         Group: groupname          #1002
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  2. Disregarding system scripts like getent, users can be in a group in two ways: either it is their principal group, defined in /etc/passwd, or they have it as a secondary group in /etc/groups.

    GROUPID=1000
sed -rn "s/^[^:]*:[^:]*:$GROUPID://p" < /etc/group | tr ',' '\n'
sed -rn "s/^([^:]*):[^:]*:[^:]*:$GROUPID:.*/\\1/p" < /etc/passwd

    Should do it nicely. awk would probably look nicer...

    GROUPID=1000
awk -F: -v "g=$GROUPID" '{if ($3==g) print $1;}' /etc/passwd
awk -F: -v "g=$GROUPID" '{if ($3==g) print $4;}' /etc/group | tr ',' '\n'
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  3. https://www.cyberciti.biz/faq/linux-list-all-members-of-a-group/ thread show multiple ways of doing this. I personally prefer members method. but the method below is native and works well.

    $ grep 'grpup-name-here' /etc/group
$ grep 'ftponly' /etc/group
$ grep -i --color 'ftponly' /etc/group
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  4. The proper way to show all users in a certain group under FreeBSD is:

    # pw groupshow groupname
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