[samuellb]

Yes, but Debian and Ubuntu has changed their default shell to Dash (in 2006 I think), and embedded systems usually use some lightweight shell such as BusyBox. So far from all systems do.

[stephenr]

Just to clarify a little:

By default Debian still uses Bash for interactive user shells, but since Squeeze (early 2011), /bin/sh is provided by Dash.

Dash is used because it's faster than Bash and has less dependencies so its more resilient to failures.

for more info see https://wiki.debian.org/Shell, https://wiki.debian.org/DashAsBinSh and https://packages.debian.org/wheezy/dash

[TeMPOraL]

Thanks for clarification!