How to get list of users not in a particular group - unix aix

Question

I am trying to retrieve the list of users who are not present in a particular group.

We are trying to validate an application with the user credentials through unix AIX server and the user should be present in a particular group. For now, we need to get the list of users who are not in the group (for our testing with various test scenarios).

I tried the below command to list users in a group.

"lsgroup -a users groupname"

Please help me how to use NOT ! operator for the above command or let me know if there is any other way to get users not in a group.

--Suriya

Do you have a list of users that you want to check against or are you using the complete list of userids on the server as your input? — acer123, Jul 17 '15 at 14:46
Hi acer123, i do not have list of users of a group. If i try to list down all users, the result is too big to compare. — Suriya Rakhunathan, Jul 20 '15 at 10:26

score 0 · Answer 1 · answered Jul 17 '15 at 14:53

0

The easiest way to do this would be to string together a couple of commands. The following example will list all users that are not in a specific group.

lsuser -a groups ALL | grep -v $GROUP |awk '{print $1}'|sort

answered Jul 17 '15 at 14:53

acer123

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1
15

It is not working. It is listing me the usage patterns for grep command as "usage: grep [-r] [-R] [-H] [-L] [-E|-F] [-c|-l|-q] [-insvxbhwyu] [-p[parasep]] -e pattern_list..." – Suriya Rakhunathan Jul 22 '15 at 09:49
i want users who are all not in group 'XYZ'. Following your command, i gave the command as lsuser -a groups ALL | grep -v $XYZ |awk '{print $1}'|sort please let me know if i gave the command in correct way – Suriya Rakhunathan Jul 22 '15 at 09:50
please give me the output of the following command: which grep – acer123 Jul 22 '15 at 12:14
"/usr/bin/grep" this was the output. is there any other options to list down the users? Please help – Suriya Rakhunathan Jul 27 '15 at 12:41
The $GROUP is a variable. You don't type that in. You type in what the actual group is that you are interested in. So, an example would be: lsuser -a groups ALL | grep -v staff | awk '{print $1}' | sort – acer123 Jul 27 '15 at 18:22

score 0 · Answer 2 · edited May 11 '18 at 14:50

I hope this helps you ... easy way:

cat /etc/passwd | grep groupID GID

You can filter using grep with specific group GID. For example you can root users using root group ID:

cat /etc/passwd | grep 0

or if you want to list all the users with their group name you can use this

awk -F':' 'NR==FNR{ a[$3]=$1; next }{ print $1", "a[$4] }' /etc/group /etc/passwd

How to get list of users not in a particular group - unix aix

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