Linux and Unix groupmod command
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About groupmod
Syntax
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Enables a super user or root to modify a group.
groupmod [-g gid [-o]] [-n group_name ] group
| -g gid | The numerical value of the group's ID. This value must be unique, unless the -o option is used. The value must be non-negative. Values between 0 and 99 are typically reserved for system groups. Any files which the old group ID is the file group ID must have the file group ID changed manually. |
| -n group_name | The name of the group will be changed from group to group_name. |
For this command to work you must have super user rights or be logged in as root.
groupmod -n bettergroup newgroup
In the above example the groupmod command would change the group "newgroup" to "bettergroup".