add user to group
#add new user to group
useradd -G developer ken
#add existing user to group
usermod -a -G developer ken
useradd -G developer ken
#add existing user to group
usermod -a -G developer ken
topics = rx.compile({[linux, osx, unix, bsd/*if any*/]}) .match(interested).then(idea => {idea.post(); print("have fun ^^"); });