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SubjectRe: ver_linux script
On Mon, Mar 13, 2000 at 09:07:43AM +0000, Riley Williams wrote:
> Hi Tim, Alan.
> >>> alias ls='ls -F'
> >>> . ver_linux
>
> >> alias make='echo banana'
> >> make bzImage
>
> >> That doesnt work either ..
>
> Is that really a fair comparison? I know quite a few people who
> use the alias I quoted, along with several others. Quite a common
> alias for the above command on Linux systems is...

It's somewhat fair, but a bit exaggerated.

> [...]
> My reading of that file is that it tries to use whichever version
> of each command is nearest in the path, and unless I'm wrong, the
> `make` command does not respect aliases, but does respect the
> PATH variable, and it was for this reason that none of the
> commands therein use paths. I tried to keep that behaviour.

I don't know about this, but if it's true then you're right,
using /bin/ls might be the Wrong Thing[tm] to do.

> I've checked now, and indeed it can't work as written, but the
> following alternative diff does exactly what was intended and has
> been verified through long years of use. This is the variant I
> was actually using:
> [patch snipped]

This doesn't work for me either. It seemed to do the same thing
that the regular ver_linux script does.

I'm not sure if I'm getting the same problem you are.
Normally I get

Linux C Library 2.1.3

but with ls aliased to 'ls -F', I get

Linux C Library 1.3.so*

even with the patch you suggested.

> The key to it doing what is required are the brackets, which
> cause the enclosed to be run in a separate subshell and thus
> insulate it from the calling environment.

Interesting.

> > Seriously though, Alan, I think it's useful to see what
> > version the kernel has been compiled with, so I've written
> > up a patch against 2.3.51 which uses /proc/version instead
> > of "uname -a" (provided that you have /proc/version, of
> > course).
>
> Probably a better idea would be to provide both.

Well, /proc/version provides most of the same information
that uname -a provides. The only things missing are the
machine type and processor type.

Perhaps a line like
cat /proc/version; echo -n "Processor: "; uname -mp
would be enough.

> > I've included the change to use "/bin/ls" instead of just
> > ls, which seems to fix the weird behaviour that Riley
> > describes.
>
> It could also prevent the script from producing the correct
> answers in some cases, so I would suggest basing a replacement
> on the application of the above diff to the original version.

It would? The only instance I can think of would be when
ls is not in /bin. Please provide an example.

Tim
--
------------------------------------------------------------------------
Tim Coleman <tim@beastor.mine.nu>
Software Developer/Systems Administrator/RDBMS Specialist/Linux Advocate
University of Waterloo Honours Co-op Combinatorics & Optimization
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