Unix-like Definition

adjective

Said of a computer operating system that behaves closely to Unix. Often used to describe systems which do not qualify for use of the Unix trademark.

"NetBSD provides its users with a free Unix-like system."
Wiktionary
Said of a computer program having design principles consistent with those of Unix.
"This program is much more Unix-like: it operates on standard I/O instead of prompting the user for filenames."
Wiktionary