All users:
$ getent passwd
All groups:
$ getent group
All groups with a specific user:
$ getent group | grep username
Answer from EEAA on serverfault.comAll users:
$ getent passwd
All groups:
$ getent group
All groups with a specific user:
$ getent group | grep username
List users and their groups:
for user in $(awk -F: '{print $1}' /etc/passwd); do groups $user; done
List groups and their users:
cat /etc/group | awk -F: '{print
3, $4}' | while read group gid members; do
members=$members,
4 == $gid {print \",\" \$1}" /etc/passwd);
echo "$group: $members" | sed 's/,,*/ /g';
done
How can I find out which users are in a group within Linux? - Unix & Linux Stack Exchange
How can I list all groups in Linux?
IOMMU groups not displaying.
You need to both enable the IOMMU kernel module, and enable VT-d/AMD-Vi in your host UEFI settings, e.g.:
https://wiki.archlinux.org/index.php/PCI_passthrough_via_OVMF#Setting_up_IOMMU
More on reddit.comHow to list installed packages that belong to a certain group?
sudo pacman -Qg gnome
to list every installed package in the gnome group.
Also:
sudo pacman -Rdd gnome
will remove all packages in the gnome group without removing their dependencies. You'll probably still need to do some manual intervention, and this may leave you with unused packages. Which can be (hopefully) gotten rid of with:
pacman -Rns $(pacman -Qtdq)More on reddit.com
How do I add a user to a group?
How do I check what group a file belongs to?
Where are group definitions stored?
Videos
You can display with the help of compgen builtin command as follows:
To display all users run following command:
compgen -uTo display all groups run following command:
compgen -g
However you can also display all users by cut -d ":" -f 1 /etc/passwd.
Here we are going to use getent for the detailed the info
We can list the user with the following command:
getent passwd
We can list the group as follows:
getent group
To fetch detail a specific user
getent passwd lalit
Replace the lalit with your user name. Lalit will not be in every system :)
You can read the more into about getent here
I prefer to use the getent command ...
Since getent uses the same name service as the system, getent will show all information, including that gained from network information sources such as LDAP.
So for a group, you should use the following ...
getent group name_of_group
where name_of_group is replaced with the group you want to look up. Note that this only returns supplementary group memberships, it doesn't include the users who have this group as their primary group.
There are a whole lot of other lookups that you can do ... passwd being another useful one, which you'll need to list primary groups.
You can use grep:
grep '^group_name_here:' /etc/group
This only lists supplementary group memberships, not the user who have this group as their primary group. And it only finds local groups, not groups from a network service such as LDAP.