Interactive Ruby Shell: Difference between revisions

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{{#REDIRECT [[Ruby (programming language}})#Features]]

{{Infobox Software

| name = Interactive Ruby Shell

{{Rcat shell|

| logo =

{{R to related topic}}

| screenshot = [[Image:Interactive Ruby Shell.png|300px|]]

{{r hist}}

| caption = The screenshot session as same as the article example

| collapsible = yes

| developer = [[Keiju Ishitsuka]] <![e-mail]-->

| latest release version = 0.9.6

| latest release date = {{release date|2009|06|30}}

| operating system = [[Cross-platform]]

| platform = [[Ruby (programming language)|Ruby interpreter]]

| programming language = [[Ruby (programming language)|Ruby]]

| genre = [[Ruby (programming language)|Ruby]] [[shell (computing)|shell]]

| license = [http://svn.ruby-lang.org/cgi-bin/viewvc.cgi/trunk/COPYING?view=markup Ruby License]<br />[[BSD licenses|BSD License]]

| website = http://www.ruby-lang.org/en/

}}

'''Interactive Ruby Shell''' ('''IRB''' or '''irb''') is a [[shell (computing)|shell]] for programming in the [[Object-oriented programming|object-oriented]] [[scripting language]] [[Ruby (programming language)|Ruby]]. The abbreviation irb comes from the fact that the [[filename extension]] for Ruby is ".rb", although interactive Ruby files do not have an extension of ".irb". The program is launched from a [[Command line interface|command line]] and allows the execution of Ruby commands with immediate response, experimenting in real-time. It features [[command history]], line editing capabilities, and [[job control (Unix)|job control]], and is able to communicate directly as a [[shell script]] over the Internet and interact with a live server. It was developed by [[Keiju Ishitsuka]].

Program usage:

irb [ options ] [ ''programfile'' ] [ ''argument...'' ]

Example usage:

<source lang="ruby">

irb(main):001:0> n = 5

=> 5

irb(main):002:0> def fact(n)

irb(main):003:1> if n <= 1

irb(main):004:2> 1

irb(main):005:2> else

irb(main):006:2* n * fact(n - 1)

irb(main):007:2> end

irb(main):008:1> end

=> nil

irb(main):009:0> fact(n)

=> 120

</source>

==See also==

{{Portal|Free software}}

* [[Comparison of computer shells]]

==External links==

*[http://tryruby.org/ "Try Ruby"] Online IRB

*[http://ruby-doc.org/docs/ProgrammingRuby/html/trouble.html "When Trouble Strikes"] chapter from ''[[Programming Ruby]]''

*[http://ruby-doc.org/docs/ProgrammingRuby/html/irb.html "Interactive Ruby Shell"] chapter from ''[[Programming Ruby]]''

{{Ruby programming language}}

{{Compu-lang-stub}}

[[Category:Ruby programming language]]