On Mon, 2005-10-03 at 12:04 +0200, Diego 'Flameeyes' Pettenò wrote:
> On Monday 03 October 2005 11:14, Duncan wrote:
Hello Duncan.
> Actually, bash is fine, as long as you declare #!/bin/bash the script. Every
> Gentoo/ALT system should have bash installed as part of base system, as bash
> is what the ebuilds are written in.
Good as this is what I was working from. I've coded the parts that
extract and parse the information from the /etc/{passwd,group} files
already as well as reading and writing the config files and not found it
necessary to make any head, tail, sed, grep, awk, wing and a prayer
calls. :) As I said, I want to write this in bash itself as much as
possible for portability.
> > Likewise, keep in mind POSIX compatibility when making any
> > sed/grep/file/etc calls. Don't assume the GNU versions. If you need the
> > info, I believe most of the manpages specify where the GNU versions
> > deviate from POSIX.
> Also here the point is not to avoid GNU calls on every tool, is just to make
> sure that the tool called is actually GNU :)
> The insidious GNUisms are the ones relative, for example, to cp or mv, which
> are base system commands. But GNUisms in sed calls are usually safe as long
> as you make sure that you're calling GNU sed. Ebuilds sanitize this aliasing
> it to gsed, while eselect uses aliases that checks the right tool to use.
>
> You can give a look to
> http://www.gentoo.org/proj/en/gentoo-alt/maintnotes.xml#doc_chap2 to have a
> list of common problems with GNUisms.
Thanks for the link. Once I start searching for processes to kill and
files to delete I'm sure that will become a good reference. I'm
thinking that these will be the only needed external programs:
find
ps
tar
gzip ? (or something else to compress things with)
I might write a test function to the install system to verify the
existence of the correct tools and switch to the correct syntax if I
need to. Although Gentoo is my primary goal I want things to work on a
minimal system of any flavor of *nix that has bash. That goal may have
to be abandoned though. We'll see.
Regards,
--
Tres Melton
IRC & Gentoo: RiverRat
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