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answers:

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how to embed a bash prompt/terminal inside ruby on rails web page?

how to execute a linux command from the web page, and get the output of the ommand?

A: 

Why would you do that? :))

It's simple though, since ruby has %x[]

output = %x[#{input}]
glebm
A: 

The simplest approach would probably be to take a preexisting [embeddable SSH implementation][1], such as a Java Applet, and include that in the page.

[1]: http://www.google.co.uk/search?hl=en&source=hp&q=java applet ssh

David Dorward