Editing Scsh

{{Short description|Unix shell}}
{{Infobox software
| name = Scsh
| logo = Scsh logo.png
| screenshot =
| caption =
| author = Olin Shivers
| developer = Brian Carlstrom<br />Martin Gasbichler<br />Mike Sperber
| released = {{Start date and age|1994|10|31|df=yes}}
| latest release version = 0.6.7
| latest release date = {{Start date and age|2006|05|16|df=yes}}
| latest preview version =
| latest preview date =
| repo = {{URL|github.com/scheme/scsh}}
| programming language = [[Scheme 48]]
| operating system = [[Unix-like]]
| platform = [[IA-32]]
| size = 4.2 MB
| language = English
| genre = [[Unix shell]]
| license = [[BSD licenses|BSD-3-Clause]]
| alexa = 
| website = {{URL|www.scsh.net}}
| standard = 
| AsOf = 
}}

'''Scsh''' (a ''Scheme shell'') is computer [[software]], a type of [[Shell (computing)|shell]] for an [[operating system]]. It is a Portable Operating System Interface ([[POSIX]]) [[application programming interface]] (API) layered on the programming language [[Scheme (programming language)|Scheme]], in a manner to make the most of Scheme's ability for [[Scripting language|scripting]]. Scsh is limited to [[32-bit]] platforms but there is a development version against the latest [[Scheme 48]] that works in [[64-bit]] mode.<ref>{{cite web |url=https://github.com/scheme/scsh |title=scheme/scsh: A Unix shell embedded in scheme|website=GitHub |access-date=2024-01-12}}</ref> It is [[free and open-source software]] released under the [[BSD licenses|BSD-3-Clause]] license.

==Features==
Scsh includes these notable features:
* [[Library (computing)|Library]] support for list, character, and [[String (computer science)|string]] manipulations;
* [[Regular expression]]s manipulation support using ''scheme regular expressions'', a [[domain-specific language]] (DSL), or little languages, approach to the abilities;
* Strong networking support;
* High-level support for [[awk]] like scripts, integrated into the language as [[Macro (computer science)|macros]];
* Abstractions supporting [[pseudo terminal]]s;
* A [[Shell (computing)|shell]] language, modeled using [[quasi-quotation]].

==Example==
* Print a list of all the executables available in the current [[Environment variable|PATH]] to the [[standard output]]:

<syntaxhighlight lang="scheme">
#!/usr/local/bin/scsh -s
!#

(define (executables dir)
  (with-cwd dir
    (filter file-executable? (directory-files dir #t))))
(define (writeln x) (display x) (newline))

(for-each writeln
  (append-map executables ((infix-splitter ":") (getenv "PATH"))))
</syntaxhighlight>

=="Acknowledgments"==
The reference manual for Scsh includes a spoof [[Acknowledgment (creative arts)|Acknowledgments]] section<ref>{{cite web |url=http://philip.greenspun.com/wtr/dead-trees/acknowledgments.html |title=Acknowledgements (reprinted in Philip Greenspun's book, ''Database-backed Web Sites'') |website=Philip Greenspun |access-date=2018-12-04}}</ref> 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.''

==See also==
{{Portal|Free and open-source software}}
*[[Unix shell]]
*[[Comparison of command shells]]

==References==
{{Reflist}}

==External links==
*{{Official website|www.scsh.net}}
*{{GitHub|scheme/scsh}}
*[http://sourceforge.net/projects/scsh/ Sourceforge project page]
*[http://www.scsh.net/download/download.html Downloads]

{{Unix shells}}
{{Lisp programming language}}

[[Category:Unix shells]]
[[Category:Scheme (programming language) interpreters]]
[[Category:Scheme (programming language) implementations]]
[[Category:Scripting languages]]
[[Category:Software using the BSD license]]

{{Unix-stub}}