Syntax:
# groupmod [options] newname oldname
| 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. |
Eg:
# groupmod –n apache1 apache
