bs is a programming language and a compiler/interpreter for modest-sized programs on UNIX systems. The bs command can be invoked either for interactive programming or with a file containing a program, optionally taking arguments, via a Unix shell, e.g., using a Shebang (Unix) #!/usr/bin/bs. An early man page states, "[bs] is a remote descendant of Basic [sic] and SNOBOL4, with a little C thrown in."