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Scsh is a Unix shell in that is has significant syntax extensions to
make writing Unix shell scripts easy (constructing pipelines, setting
I/O redirection, conditional execution etc.). It also offers access to
lower-level functionality like all Posix system calls, TCP/IP sockets
and a full-featured regular expression library. This is embedded into
a general-purpose programming language with real data types,
extensive, syntactically clean control constructs and "real" quoting
rules.
Scsh is also a full implementation of R4RS Scheme with some
non-standard behavior (required for scripting). As a result, a wide
variety of existing Scheme code can be used.
The underlying Scheme implementation is a virtual machine for compact
byte code.
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