users and scripts
Bill Maltby - LFS Related
lfsbill at wlmcs.com
Thu Oct 24 13:47:03 PDT 2002
On Thu, 24 Oct 2002, Eric Miller wrote:
>I am doing my 4.0 install partially scripted. I am wondering, if an install
>script is run as user lfs or root or whatever, does the script run as that
>user, or as a system uid?
Without extra effort, scripts run as the user that invoked them.
>This may sound like a silly question, but here is the root of it: I have
>all of chapter 5 completely scripted, and it runs flawlessly. The script
>declares LFS=/mnt/lfs and some other env variables that are useful (e.g.
>src=/$LFS/static/src/), and the script itself uses these to install all of
>Chapter 5 without error. However, when the script is finished, and is
>kicked back out to the prompt, if I echo $LFS or $src, I get nothing? Yes,
>I have two seperate scripts, one for pre su - lfs and one for post su -lfs.
>Both scripts declare both values at the beginning and run perfectly.
man bash! In there you will be able to see that variables set inside a
lower lever shell are not exported to the calling shell. There are a few
ways around this. But not seeing your scripts, I will not suggest one of
the methods because there could be endesired side-effects.
>Is there a difference between 'LFS=/mnt/lfs' and 'export LFS=/mnt/lfs'? I
>have tried it both ways and still get nothing when I echo either $value
>after the script has finished successfully.
Yes, there is a difference. However, environments are exported *downward*,
not "upward", so the effect in your particular case is identical regarding
what you apparently expected to see.
billm at wlmcs.com
Unsubscribe: send email to listar at linuxfromscratch.org
and put 'unsubscribe lfs-support' in the subject header of the message
More information about the lfs-support