Scsh is a systems-programming environment for POSIX systems and Win32, embedded in the Scheme programming language. It includes a high-level process notation for writing shell-script like programs, with pipelines and redirections. Scsh additionally provides low-level access to POSIX primitives, plus important non-POSIX extensions such as sockets.

Scsh is a POSIX API layered on top of the Scheme programming language (currently only a Scheme 48 implementation exists, but others are planned) in a manner to make the most of scheme's capability for scripting. It is limited to 32-bit platforms.