Scsh

Scsh
Original author(s)	Olin Shivers
Developer(s)	Brian Carlstrom; Martin Gasbichler; Mike Sperber
Initial release	31 October 1994;29 years ago
Stable release	0.6.7 / 16 May 2006;18 years ago
Repository	github/scheme/scsh
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

Scsh(aScheme shell) is computersoftware,a type ofshellfor 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-bitplatforms but there is a development version against the latestScheme 48that works in64-bitmode.^[1]It isfree and open-source softwarereleased under theBSD-3-Clauselicense.

Features

Scsh includes these notable features:

Librarysupport for list, character, andstringmanipulations;
Regular expressionsmanipulation support usingscheme regular expressions,adomain-specific language(DSL), or little languages, approach to the abilities;
Strong networking support;
High-level support forawklike scripts, integrated into the language asmacros;
Abstractions supportingpseudo terminals;
Ashelllanguage, modeled usingquasi-quotation.

Example

Print a list of all the executables available in the currentPATHto 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"))))

"Acknowledgments"

The reference manual for Scsh includes a spoofAcknowledgmentssection^[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.