I am trying to add one more group in already added supplementary groups for a user.
rcc
is the name of the supplementary group I need to add
sm254040
is the user id.
when I run the command
usermod -a -G rcc sm254040
I am getting the below error:
UX: usermod: ERROR: Invalid syntax
What should I use to append a supplementary group in already added supplementary groups?