mailing-list for TeXmacs Users

[Martin Costabel <address@hidden>]

Andrey G. Grozin wrote:
[]
> The problem with the above files is that Joris says that they don't work 
> on his Mac. I tried them on my friend's Mac notebook, and they work 
> fine. The difference can be traced to a single 'sed' command which 
> extracts 3 components of the maxima version from a line which contains 
> them. The following line (when executed in /bin/sh ):
>
> echo 'version 5.16.3, lisp sbcl' |\
> sed -e 's/^version \([0-9]\+\)\.\([0-9]\+\)\.\([0-9]\+\).*$/\1 \2 \3/'
>
> should produce
>
> 5 16 3
>
> according to sed documentation, and it does so on Linux. It does so also 
> on my friend's Mac. Joris says that it does not on his Mac.

Your friend probably has a 3rd-party GNU sed installed (from Fink, for 
example). Apple's /usr/bin/sed is BSD sed and doesn't know (in its basic 
regex mode) about '\+'.

What works for me with both flavors of sed is the following

echo 'version 5.16.3, lisp sbcl' |\
sed -e 's/^version 
\([0-9][0-9]*\)\.\([0-9][0-9]*\)\.\([0-9][0-9]*\).*$/\1 \2 \3/'

Actually, it works the same way also with the simpler

echo 'version 5.16.3, lisp sbcl' |\
sed -e 's/^version \([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*$/\1 \2 \3/'

but this is not logically equivalent to your regex.

--
Martin