Scsh
Original author	Olin Shivers
Developers	Brian Carlstrom Martin Gasbichler Mike Sperber
Initial release	31 October 1994; 31 years ago (1994-10-31)
Stable release	0.6.7 / 16 May 2006; 19 years ago (2006-05-16)
Written in	Scheme 48
Operating system	Unix-like
Platform	IA-32
Size	4.2 MB
Available in	English
Type	Unix shell
License	BSD-3-Clause
Website	www.scsh.net
Repository	github.com/scheme/scsh

Scsh (aScheme shell) is computersoftware, a type ofshell for anoperating system. It is a Portable Operating System Interface (POSIX)application programming interface (API) layered on the programming languageScheme, in a manner to make the most of Scheme's ability forscripting. Scsh is limited to32-bit platforms but there is a development version against the latestScheme 48 that works in64-bit mode.^[1] It isfree and open-source software released under theBSD-3-Clause license.

Scsh includes these notable features:

• Library support for list, character, andstring manipulations;
• Regular expressions manipulation support usingscheme regular expressions, adomain-specific language (DSL), or little languages, approach to the abilities;
• Strong networking support;
• High-level support forawk like scripts, integrated into the language asmacros;
• Abstractions supportingpseudo terminals;
• Ashell language, modeled usingquasi-quotation.

• Print a list of all the executables available in the currentPATH to thestandard output:

#!/usr/local/bin/scsh-s!#(define(executablesdir)(with-cwddir(filterfile-executable?(directory-filesdir#t))))(define(writelnx)(displayx)(newline))(for-eachwriteln(append-mapexecutables((infix-splitter":")(getenv"PATH"))))

The reference manual for Scsh includes a spoofAcknowledgments section^[2] written by Olin Shivers. It starts:

Who should I thank? My so-called "colleagues", who laugh at me behind my back, all the while becoming famous on my work? My worthless graduate students, whose computer skills appear to be limited to downloading bitmaps off of netnews? My parents, who are still waiting for me to quit "fooling around with computers," go to med school, and become a radiologist? My department chairman, a manager who gives one new insight into and sympathy for disgruntled postal workers?

and concludes with:

Oh, yes, the acknowledgements. I think not. I did it. I did it all, by myself.

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