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I decided that I want to learn more about Linux and try building LFS. I'm using Ubuntu 11.04 as host system and Ubuntu uses dash and mawk by default. I've changed mawk to gawk, but considering that mawk is much faster than gawk I'm thinking that I might want to use mawk anyway.

Since making bash the default shell will have a negative effect on the system's performance, especially boot times I'm hesitant to make the change.

In the LFS book you can read the following:

Symlinks that point to other software (such as dash, mawk, etc.) may work, but are not tested or supported by the LFS development team, and may require either deviation from the instructions or additional patches to some packages.

So I'm basically on my own if something fails, but it might work. So I was hoping that someone with more experience could tell me if it will work and if not what would be required to make it work?

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Can I challenge to measure boot times with bash installed, versus with dash installed. You are probably not even going to notice. –  Tshepang May 5 '11 at 18:36
    
One important thing is when building something like LFS, try as hard as possible to stay with the book. You can always revert to dash anyways, once you don't need the host anymore (i.e. after you log into your LFS system). –  Tshepang May 5 '11 at 18:37
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@Thespang "The boot speed improvements in Ubuntu 6.10 were often incorrectly attributed to Upstart, which is a fine platform for future development of the init system but in Ubuntu 6.10 was primarily running in System V compatibility mode with only small behavioural changes. These improvements were in fact largely due to the changed /bin/sh." From: wiki.ubuntu.com/DashAsBinSh –  Erik B May 5 '11 at 18:47
    
@ErikB: Do you mind checking on your system? –  Tshepang May 5 '11 at 18:59
    
Also, next time just use the first three letters in order for me to get a notification. Either that, or install this script stackapps.com/q/2051/5198. –  Tshepang May 5 '11 at 19:02

2 Answers 2

I had the same question, and found the answer. See the following link (it also provides the method of using bash in debian), it seems we have to use bash... http://www.linuxfromscratch.org/blfs/view/svn/postlfs/dash.html

Note
If you create the symbolic link from dash to sh, you will need to reset the link to bash to build LFS.

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I recommend using gawk instead of mawk because of some errors that appear later on in the build, something to do with glibc. remember to ln -s /usr/bin/awk /usr/bin/gawk. at least that's what I found using Debian squeeze as the host.

As said above follow the book to the letter the first few times until your happy, then backup and mess around with it.

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