I know how to add users to the sudo group or how to remove him/her from it:
sudo usermod -aG wheel $1 # $1 represents the username as an argument passed to the command
sudo gpasswd -d $1 wheel
How do I make it a toggle? If the user is in the sudo group, I'd remove it from the group, otherwise add it. It's useful for temporarily granting sudo privileges.
Use an if
that checks whether the user is currently in the group.
See also Check if a user is in a group, from which I borrowed this check.
if [[ " $(id -Gn "$1") " == *" wheel "* ]]; then
sudo gpasswd -d "$1" wheel
else
sudo usermod -aG wheel "$1 "
fi