Editing Shell script (section)

== Typical POSIX scripting languages ==
{{Main|Unix shell}}

Scripting languages commonly found on UNIX, Linux, and POSIX-compliant operating system installations include:
* [[KornShell]] (<code>ksh</code>) in several possible versions such as ksh88, Korn Shell '93 and others.
* The [[Bourne shell]] (<code>sh</code>), one of the oldest shells still common in use
* The [[C shell]] (<code>csh</code>)
* [[Bash (Unix shell)|GNU Bash]] (<code>bash</code>)
* <code>[[tclsh]]</code>, a shell which is a main component of the [[Tcl/Tk]] programming language.
* The [[wish (shell)|wish]] is a GUI-based Tcl/Tk shell.

The C and Tcl shells have syntax quite similar to that of said programming languages, and the Korn shells and Bash are developments of the Bourne shell, which is based on the [[ALGOL]] language with elements of a number of others added as well.<ref>Unix Shells By Example, pp 7-10,</ref> On the other hand, the various shells plus tools like [[awk]], [[sed]], [[grep]], and [[BASIC]], [[Lisp (programming language)|Lisp]], [[C (programming language)|C]] and so forth contributed to the [[Perl]] programming language.<ref>Programming Perl, 5th Edition, preface</ref>

Other shells that may be available on a machine or for download and/or purchase include:
* [[Almquist shell]] (<code>ash</code>)
* Nushell (<code>nu</code>)
* [[PowerShell]] (<code>msh</code>)
* [[Z shell]] (<code>zsh</code>, a particularly common enhanced KornShell)
* The [[Tenex C Shell]] (<code>tcsh</code>).

Related programs such as shells based on [[Python (programming language)|Python]], [[Ruby (programming language)|Ruby]], [[C (programming language)|C]], [[Java (programming language)|Java]], [[Perl]], [[Pascal (programming language)|Pascal]], [[Rexx]] etc. in various forms are also widely available. Another somewhat common shell is [[Old shell]] (<code>osh</code>), whose manual page states it "is an enhanced, backward-compatible port of the standard command interpreter from Sixth Edition UNIX."<ref>{{Cite web|url=https://manned.org/osh/f30afb07|title=osh - manned.org|website=manned.org|access-date=2019-01-16}}</ref>

So called remote shells such as 

* a [[Remote Shell]] (<code>rsh</code>)
* a [[Secure Shell]] (<code>ssh</code>)
are really just tools to run a more complex shell on a remote system and have no 'shell' like characteristics themselves.