From: Matthias Ludwig <matthias@...>
Date: 2006-08-11T23:42:18+09:00
Subject: Re: access built-in shell commands like 'history' or 'fc'

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> I think under certain circumstances either ruby doesn't call the shell
> (and just calls the executable) or the shell doesn't recognize builtin
> commands when called as sh -c

that's it.
The most shells provide build-in commands only in the interactive mode.
Some shells coIMost shells print something like "can't find...", some
shells also print a littl help.

example (on zsh):

$ echo history | zsh
history: not interactive shell

regards,
Matthias

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