[SOLVED] Check if a user is in a group

Issue

I have a server running where I use php to run a bash script to verify certain information of a user. For example, I have a webhosting server set up, and in order to be able to add another domain to their account I want to verify if the user is actually a member of the 'customers' group. What would be the best way to do this?

I have searched google, but all it comes up with is ways to check whether a user or a group exists, so google is not being a big help right now.

Solution

Try doing this :

username=ANY_USERNAME
if getent group customers | grep -qw "$username"; then
    echo true
else
    echo false
fi

or

username=ANY_USERNAME
if groups $username | grep -qw 'customers'; then
    echo true
else
    echo false
fi

Answered By - Gilles Quénot

Answer Checked By - Terry (WPSolving Volunteer)