modify a user account |
-a, --append Add the user to the supplementary group(s). Use only with the -G option. |
-G, --groups GROUP1[,GROUP2,...[,GROUPN]]] A list of supplementary groups which the user is also a member of. Each group is separated from the next by a comma, with no intervening whitespace. The groups are subject to the same restrictions as the group given with the -g option. If the user is currently a member of a group which is not listed, the user will be removed from the group. This behaviour can be changed via the -a option, which appends the user to the current supplementary group list. |
usermod [options] LOGIN The usermod command modifies the system account files to reflect the changes that are specified on the command line. |