groupadd, groupdel, groupmod, groups: update page (#7660)

pages/common/groups.md

@@ -1,16 +1,13 @@
 # groups
 
 > Print group memberships for a user.
+> See also: `groupadd`, `groupdel`, `groupmod`.
 > More information: <https://www.gnu.org/software/coreutils/groups>.
 
 - Print group memberships for the current user:
 
 `groups`
 
-- Print group memberships for a specific user:
-
-`groups {{username}}`
-
 - Print group memberships for a list of users:
 
-`groups {{username1}} {{username2}} {{username3}}`
+`groups {{username1 username2 ...}}`

pages/linux/groupadd.md

@@ -1,12 +1,17 @@
 # groupadd
 
 > Add user groups to the system.
+> See also: `groups`, `groupdel`, `groupmod`.
 > More information: <https://manned.org/groupadd>.
 
-- Create a new Linux group:
+- Create a new group:
 
-`groupadd {{group_name}}`
+`sudo groupadd {{group_name}}`
 
-- Create new group with a specific groupid:
+- Create a new system group:
 
-`groupadd {{group_name}} -g {{group_id}}`
+`sudo groupadd --system {{group_name}}`
+
+- Create a new group with the specific groupid:
+
+`sudo groupadd --gid {{id}} {{group_name}}`

pages/linux/groupdel.md

@@ -1,8 +1,9 @@
 # groupdel
 
 > Delete existing user groups from the system.
+> See also: `groups`, `groupadd`, `groupmod`.
 > More information: <https://manned.org/groupdel>.
 
 - Delete an existing group:
 
-`groupdel {{group_name}}`
+`sudo groupdel {{group_name}}`

pages/linux/groupmod.md

@@ -1,12 +1,13 @@
 # groupmod
 
 > Modify existing user groups in the system.
+> See also: `groups`, `groupadd`, `groupdel`.
 > More information: <https://manned.org/groupmod>.
 
 - Change the group name:
 
-`groupmod -n {{new_group_name}} {{old_group_name}}`
+`sudo groupmod --new-name {{new_group}} {{group_name}}`
 
 - Change the group id:
 
-`groupmod -g {{new_group_id}} {{old_group_name}}`
+`sudo groupmod --gid {{new_id}} {{group_name}}`