Re: [PLUG] bash command missing

[JP Vossen <jp@jpsdomain.org>]

> Date: Thu, 30 Aug 2007 14:13:14 -0400
> From: "Chad Waters" <chad@chadwaters.com>
> Subject: Re: [PLUG] bash command missing
>
> On 8/30/07, Brent Saner  wrote:
> > > i was under the impression it uses dash now, and dash is planned
> > > for release in upcoming debian...
>
> This might explain the confusion
>
> *@*:~$ ls -l /bin/*sh
> -rwxr-xr-x 1 root root 701008 2007-08-27 05:41 /bin/bash
> -rwxr-xr-x 1 root root  80308 2007-07-29 23:15 /bin/dash
> lrwxrwxrwx 1 root root      4 2007-08-27 08:23 /bin/rbash -> bash
> lrwxrwxrwx 1 root root      4 2006-10-10 11:19 /bin/sh -> dash
>
> /bin/sh is a link to dash.
>
> bash however is the default user shell. Just created via adduser:
> testuser:x:1002:1002:,,,:/home/testuser:/bin/bash


Correct.  As of Ubuntu 6.10 /bin/sh --> dash, not bash.  And a future 
Debian (e.g. Lenny) will make the switch as well.  It is my 
understanding this is to improve (perhaps drastically) boot speed, since 
dash is much smaller than bash, and whatever "/bin/sh" is gets called a 
gazillion times during boot.
	https://wiki.ubuntu.com/DashAsBinSh
	http://release.debian.org/lenny-goals.txt

HOWEVER, the default user shell is still bash, though of course you can 
use chsh or just edit /etc/passwd however you feel like.

Grab our presentation files from 
http://conferences.oreillynet.com/presentations/ubuntu2007/ul_albingvossen.zip 
and open 04_bash_vs_dash.odp for 20 slides on the differences and 
gotchas (there are a bunch).  Pay attention to the slide titles when 
reading!

As for why 'bc' didn't work, from the thread above it sounds like it 
simply wasn't installed...  The following trivially finds the package to 
install, though it was already noted above that it's (wait for it) 'bc':
	apt-cache search bc | grep '^bc'
		...
		bc - The GNU bc arbitrary precision calculator language
		...

Later,
JP
----------------------------|:::======|-------------------------------
JP Vossen, CISSP            |:::======|        jp{at}jpsdomain{dot}org
My Account, My Opinions     |=========|      http://www.jpsdomain.org/
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