All users:
$ getent passwd
All groups:
$ getent group
All groups with a specific user:
$ getent group | grep username
StrongDM
strongdm.com › blog › security
How to List All Groups in Linux: Complete Command Guide
April 21, 2025 - One of the most common and straightforward ways to list all groups in Linux systems is by leveraging the Linux "list groups" command. However, this isn’t the only way. There are several alternative methods, such as the "getent" command, the ...
GeeksforGeeks
geeksforgeeks.org › linux-unix › groups-command-in-linux-with-examples
Groups Command in Linux - GeeksforGeeks
May 12, 2026 - Here the current user is a demon. So, when we give "groups" command we only get groups in which 'demon' is a user. ... This example shows how to check the group memberships of the root user account. The root user is the superuser in Linux and typically has full system privileges.
Checking IOMMU Groups in a Live instance of Linux...
Alright--so, I made some progress on my own:
I tried booting Antergos Live, and it allowed me to make command line arguments. It was hanging trying to boot into live on its own and some googling suggested I try the argument modprobe.blacklist=nouveau. After that, I could get into Antergos and it seemed like most of my hardware was working fine in the desktop environment. (Bluetooth wasn't. RIP)
So, I rebooted again and added the arguments intel_iommu=on and iommu=pt. I continued following the guide and got the following info on my IOMMU groups:
[antergos@ant-18.6 ~]$ dmesg | grep -e DMAR -e IOMMU
[ 0.000000] ACPI: DMAR 0x000000003A53D658 0000A8 (v01 INTEL SKL 00000001 INTL 00000001)
[ 0.000000] DMAR: IOMMU enabled
[ 0.003333] DMAR: Host address width 39
[ 0.003333] DMAR: DRHD base: 0x000000fed90000 flags: 0x0
[ 0.003333] DMAR: dmar0: reg_base_addr fed90000 ver 1:0 cap 1c0000c40660462 ecap 7e3ff0505e
[ 0.003333] DMAR: DRHD base: 0x000000fed91000 flags: 0x1
[ 0.003333] DMAR: dmar1: reg_base_addr fed91000 ver 1:0 cap d2008c40660462 ecap f050da
[ 0.003333] DMAR: RMRR base: 0x0000003a26e000 end: 0x0000003a28dfff
[ 0.003333] DMAR: RMRR base: 0x0000003b800000 end: 0x0000003fffffff
[ 0.003333] DMAR-IR: IOAPIC id 2 under DRHD base 0xfed91000 IOMMU 1
[ 0.003333] DMAR-IR: HPET id 0 under DRHD base 0xfed91000
[ 0.003333] DMAR-IR: x2apic is disabled because BIOS sets x2apic opt out bit.
[ 0.003333] DMAR-IR: Use 'intremap=no_x2apic_optout' to override the BIOS setting.
[ 0.003333] DMAR-IR: Enabled IRQ remapping in xapic mode
[ 2.749309] DMAR: No ATSR found
[ 2.749346] DMAR: dmar0: Using Queued invalidation
[ 2.749349] DMAR: dmar1: Using Queued invalidation
[ 2.749496] DMAR: Hardware identity mapping for device 0000:00:00.0
[ 2.749497] DMAR: Hardware identity mapping for device 0000:00:01.0
[ 2.749501] DMAR: Hardware identity mapping for device 0000:00:02.0
[ 2.749503] DMAR: Hardware identity mapping for device 0000:00:14.0
[ 2.749504] DMAR: Hardware identity mapping for device 0000:00:14.2
[ 2.749505] DMAR: Hardware identity mapping for device 0000:00:16.0
[ 2.749506] DMAR: Hardware identity mapping for device 0000:00:17.0
[ 2.749507] DMAR: Hardware identity mapping for device 0000:00:1c.0
[ 2.749508] DMAR: Hardware identity mapping for device 0000:00:1c.4
[ 2.749509] DMAR: Hardware identity mapping for device 0000:00:1d.0
[ 2.749510] DMAR: Hardware identity mapping for device 0000:00:1d.5
[ 2.749512] DMAR: Hardware identity mapping for device 0000:00:1d.6
[ 2.749513] DMAR: Hardware identity mapping for device 0000:00:1f.0
[ 2.749514] DMAR: Hardware identity mapping for device 0000:00:1f.2
[ 2.749515] DMAR: Hardware identity mapping for device 0000:00:1f.3
[ 2.749516] DMAR: Hardware identity mapping for device 0000:00:1f.4
[ 2.749518] DMAR: Hardware identity mapping for device 0000:01:00.0
[ 2.749521] DMAR: Hardware identity mapping for device 0000:3c:00.0
[ 2.749524] DMAR: Hardware identity mapping for device 0000:3d:00.0
[ 2.749527] DMAR: Hardware identity mapping for device 0000:3e:00.0
[ 2.749527] DMAR: Setting RMRR:
[ 2.749528] DMAR: Ignoring identity map for HW passthrough device 0000:00:02.0 [0x3b800000 - 0x3fffffff]
[ 2.749529] DMAR: Ignoring identity map for HW passthrough device 0000:00:14.0 [0x3a26e000 - 0x3a28dfff]
[ 2.749531] DMAR: Prepare 0-16MiB unity mapping for LPC
[ 2.749531] DMAR: Ignoring identity map for HW passthrough device 0000:00:1f.0 [0x0 - 0xffffff]
[ 2.749549] DMAR: Intel(R) Virtualization Technology for Directed I/O
[antergos@ant-18.6 ~]$ #!/bin/bash/
[antergos@ant-18.6 ~]$ shopt -s nullglob
[antergos@ant-18.6 ~]$ for d in /sys/kernel/iommu_groups/*/devices/*; do
> n=${d#*/iommu_groups/*/devices/*}; n=${n%%/*}
> printf 'IOMMU Group %s ' "$n"
> lspci -nns "${d##*/}"
> done;
IOMMU Group 0000:00:00.0 00:00.0 Host bridge [0600]: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Host Bridge/DRAM Registers [8086:1910] (rev 07)
IOMMU Group 0000:00:1d.6 00:1d.6 PCI bridge [0604]: Intel Corporation Sunrise Point-H PCI Express Root Port #15 [8086:a11e] (rev f1)
IOMMU Group 0000:00:1f.0 00:1f.0 ISA bridge [0601]: Intel Corporation Sunrise Point-H LPC Controller [8086:a14e] (rev 31)
IOMMU Group 0000:00:1f.2 00:1f.2 Memory controller [0580]: Intel Corporation Sunrise Point-H PMC [8086:a121] (rev 31)
IOMMU Group 0000:00:1f.3 00:1f.3 Audio device [0403]: Intel Corporation Sunrise Point-H HD Audio [8086:a170] (rev 31)
IOMMU Group 0000:00:1f.4 00:1f.4 SMBus [0c05]: Intel Corporation Sunrise Point-H SMBus [8086:a123] (rev 31)
IOMMU Group 0000:3c:00.0 3c:00.0 Non-Volatile memory controller [0108]: Samsung Electronics Co Ltd NVMe SSD Controller SM961/PM961 [144d:a804]
IOMMU Group 0000:3d:00.0 3d:00.0 Ethernet controller [0200]: Qualcomm Atheros Killer E2400 Gigabit Ethernet Controller [1969:e0a1] (rev 10)
IOMMU Group 0000:3e:00.0 3e:00.0 Network controller [0280]: Intel Corporation Wireless 8265 / 8275 [8086:24fd] (rev 78)
IOMMU Group 0000:00:01.0 00:01.0 PCI bridge [0604]: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor PCIe Controller (x16) [8086:1901] (rev 07)
IOMMU Group 0000:01:00.0 01:00.0 VGA compatible controller [0300]: NVIDIA Corporation GP106M [GeForce GTX 1060 Mobile 3GB] [10de:1c20] (rev a1)
IOMMU Group 0000:00:02.0 00:02.0 VGA compatible controller [0300]: Intel Corporation HD Graphics 530 [8086:191b] (rev 06)
IOMMU Group 0000:00:14.0 00:14.0 USB controller [0c03]: Intel Corporation Sunrise Point-H USB 3.0 xHCI Controller [8086:a12f] (rev 31)
IOMMU Group 0000:00:14.2 00:14.2 Signal processing controller [1180]: Intel Corporation Sunrise Point-H Thermal subsystem [8086:a131] (rev 31)
IOMMU Group 0000:00:16.0 00:16.0 Communication controller [0780]: Intel Corporation Sunrise Point-H CSME HECI #1 [8086:a13a] (rev 31)
IOMMU Group 0000:00:17.0 00:17.0 SATA controller [0106]: Intel Corporation Sunrise Point-H SATA Controller [AHCI mode] [8086:a103] (rev 31)
IOMMU Group 0000:00:1c.0 00:1c.0 PCI bridge [0604]: Intel Corporation Sunrise Point-H PCI Express Root Port #1 [8086:a110] (rev f1)
IOMMU Group 0000:00:1c.4 00:1c.4 PCI bridge [0604]: Intel Corporation Sunrise Point-H PCI Express Root Port #5 [8086:a114] (rev f1)
IOMMU Group 0000:00:1d.0 00:1d.0 PCI bridge [0604]: Intel Corporation Sunrise Point-H PCI Express Root Port #9 [8086:a118] (rev f1)
IOMMU Group 0000:00:1d.5 00:1d.5 PCI bridge [0604]: Intel Corporation Sunrise Point-H PCI Express Root Port #14 [8086:a11d] (rev f1) More on reddit.com 1
8
June 17, 2018Crontab and group washing
Can you provide more details what you mean by wash? More on reddit.com
4
2
February 8, 2020Sudoing into Root.
If I'm understanding your requirement correctly then :
-
Add an account that is able to log into your machine (user1) into CyberArk.
-
Add the root account into CyberArk for target machine, into CyberArk.
-
Associate the "user1" account as the logon account for "root" (you can associate logon accounts in the detailed account view).
When someone someone clicks connect on the root account, it will first connect to user1, and then issue an sudo root command automatically.
More on reddit.com 3
4
July 19, 2017IOMMU 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.com 1
2
April 3, 2020How do I add a user to a group?
Use `usermod -aG groupname username`. See our guide on adding a user to a group.
linuxize.com
linuxize.com › home › linux commands › how to list groups in linux
How to List Groups in Linux | Linuxize
How do I check what group a file belongs to?
Run `ls -l` to view file details. The fourth column shows the group assigned to each file.
linuxize.com
linuxize.com › home › linux commands › how to list groups in linux
How to List Groups in Linux | Linuxize
Where are group definitions stored?
Group definitions are stored in `/etc/group`. Each line contains the group name, a password placeholder, the GID, and a comma-separated member list, all separated by colons.
linuxize.com
linuxize.com › home › linux commands › how to list groups in linux
How to List Groups in Linux | Linuxize
Videos
Managing Linux users and groups from the command line
06:29
users and groups made simple - YouTube
05:03
Command Line Skills: Creating User Groups - YouTube
03:24
How to Use “groups” Command in Linux [6 Practical Examples] ...
07:40
Creating and Working with Groups - Linux Tutorial 19 - YouTube
10:08
Working With Users and Groups (Linux Zero to Hero 2022) - YouTube
Linuxize
linuxize.com › home › linux commands › how to list groups in linux
How to List Groups in Linux | Linuxize
May 16, 2026 - Find which groups a user belongs to in Linux using the groups, id, and getent commands. Includes how to list all groups and group members on the system.
ArchWiki
wiki.archlinux.org › title › Users_and_groups
Users and groups - ArchWiki - Arch Linux
May 3, 2026 - On many systems, audio recording ... with the commands, "cat /dev/audio > myfile" and "cat myfile > /dev/audio," respectively. Every file on a GNU/Linux system is owned by a user and a group. In addition, there are three types of access permissions: read, write, and execute. Different access permissions can be applied to a file's owning user, owning group, and others (those without ownership). One can determine a file's owners and permissions by viewing the long listing format of ...
nixCraft
cyberciti.biz › nixcraft › howto › linux › linux / unix groups command examples
Linux / Unix groups Command Examples - nixCraft
September 15, 2024 - for u in $(compgen -u) do echo "*** Group memembership for $u:" groups "$u" echo done · The first line, for u in $(compgen -u), uses the compgen command to generate a list of all Linux usernames on the system using the /etc/passwd file.
KodeKloud
kodekloud.com › blog › how-to-list-all-groups-in-linux
How to List All Groups in Linux
November 5, 2025 - Understand what groups are in Linux and how they manage permissions and collaboration. Learn the difference between primary and secondary groups. Explore why groups are essential for user management, resource access, and security. Discover multiple methods to list all groups, from viewing /etc/group to using commands like getent, cut, and awk.
Beebom
beebom.com › how-list-groups-linux
How to List Groups in Linux (CLI and GUI Methods) | Beebom
October 15, 2025 - The simplest Linux command to list all groups is the groups command.
Top answer 1 of 8
164
All users:
$ getent passwd
All groups:
$ getent group
All groups with a specific user:
$ getent group | grep username
2 of 8
29
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
HowtoForge
howtoforge.com › home › linux groups command for beginners (with examples)
Linux Groups Command for Beginners (with Examples)
To get more information about groups, use the standard --help and --version command line flags. ... Are you seeking for a command to add a Linux group? The command you are looking for is named addgroup.
Command Linux
commandlinux.com › home › how to › how to linux list all groups
How to Linux List All Groups
March 26, 2026 - For a single group’s details, append its name: getent group sudo. The underlying getgroups system call handles how the kernel surfaces supplementary group lists to running processes.
GeeksforGeeks
geeksforgeeks.org › linux-unix › group-management-in-linux
Group Management in Linux - GeeksforGeeks
May 18, 2026 - Group security information, including encrypted passwords and administrators, is stored in the /etc/gshadow file. This file is used by the system for secure group management. ... The usermod command is used to modify user account settings in Linux. It allows administrators to add users to secondary groups for permission management.
Red Hat
redhat.com › sysadmin › linux-commands-manage-groups
3 basic Linux group management commands every sysadmin should know
October 28, 2021 - Sysadmins are likely to add groups ... needs to Linux servers. Most of these needs center on controlling access to files, directories, or other resources. You can even use groups help manage sudo access. ... Note: These commands require root or administrative privileges. This command adds projectA to the /etc/group file. The file contains the group name, password (if any), group ID, and a list of existing ...
Linux Hint
linuxhint.com › groups-command-linux
How to Run 'groups' command in Linux
The “getent” command shows entries from specified databases, which can be used to get a list of all groups: ... If no output comes, it means the group does not exist. ... To print help information, type the “–help” command in a terminal. It gives a brief description and the related links of the “groups” command. ... A “group” in Linux is a collection of users.
LabEx
labex.io › tutorials › linux-how-to-list-all-the-groups-in-the-linux-system-409869
How to list all the groups in the Linux system | LabEx
Let's explore some common commands for managing groups and user permissions in a Ubuntu 22.04 system: ## List all groups $ groups ## Create a new group $ sudo groupadd dev ## Add a user to a group $ sudo usermod -aG dev username ## Remove a ...
ZDNET
zdnet.com › home › tech › services & software › operating systems › linux
5 Linux commands for better group management (and how to use them) | ZDNET
July 27, 2024 - The command for that would be: ... At this point, the zdnet_welcome.txt file will be available to all members of the data_users group. Also: Why don't more people use desktop Linux?
Linux Command Library
linuxcommandlibrary.com › basic › usersgroups
Users & Groups | Basic | Cheat sheet | Linux Command Library
LinuxCommandLibrary · $ groupadd [name] $ addgroup [name] $ groupdel [name] $ groupmod -n [newGroupname] [oldGroupname] $ useradd [name] $ adduser [name] $ userdel [name] $ deluser [name] $ usermod -l [newUsername] [oldUsername] $ passwd [name] ...
Linux Man Pages
man7.org › linux › man-pages › man1 › groups.1.html
groups(1) - Linux manual page
GROUPS(1) User Commands GROUPS(1) groups - print the groups a user is in · groups [OPTION]... [USERNAME]... Print group memberships for each USERNAME or, if no USERNAME is specified, for the current process (which may differ if the groups database has changed).
Baeldung
baeldung.com › home › administration › user administration › list all groups in linux
List All Groups in Linux | Baeldung on Linux
March 18, 2024 - The first way to reach our goal is to use the groups command. This command is shipped with the shadow-utils package. Therefore, it’s available on all Linux distros by default. If we don’t give it any arguments, the groups command will list all groups of the current user:
GeeksforGeeks
geeksforgeeks.org › groups-command-in-linux-with-examples
Groups Command in Linux With Examples - GeeksforGeeks
September 11, 2024 - Groups command prints the names of the primary and any supplementary groups for each given username, or the current process if no names are given. If more than one name is given, the name of each user is printed before the list of that user’s ...
RunCloud
runcloud.io › blog › linux-users-groups-ubuntu
How to List Linux Users and Groups in Ubuntu with Command Line
May 22, 2024 - If you want to fetch a list of group accounts on a Unix system (stored in a database called group), then you can use the command getent group. The who command can be used to list all users currently logged into the system: who · In Linux, there ...