single-purpose
Almost nothing in Perl serves a single purpose. Larry Wall
Our single purpose was to walk through snow With faces swung to their prodigious North Like compass iron. Stephen Spender
There is surely nothing other than the single purpose of the present moment. A man's whole life is a succession of moment after moment. If one fully understands the present moment, there will be nothing else to do, and nothing else to pursue. Live being true to the single purpose of the moment. Yamamoto Tsunetomo
People don't want lots and lots of single purpose devices. They do not want to have to learn how to set up something for photos, another thing for music, another thing for video. Bill Gates
Forget purpose. It's okay to be happy without one. The quest for a single purpose has ruined many lives. James Altucher