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Re: sed


From: Stephane Chazelas
Subject: Re: sed
Date: Thu, 15 Feb 2007 19:13:22 +0000
User-agent: Mutt/1.5.6i

On Wed, Feb 14, 2007 at 11:16:23AM -0600, Matthew Woehlke wrote:
[...]
> Right. And if you use '#!/bin/bash' on Solaris, you're screwed. I'll 
> stick to writing /portable/ scripts, thank you.
[...]

I use:

#! /bin/sh -
# ensure `POSIX' shell for Solaris
false ^ true && [ -x /usr/xpg4/bin/sh ] &&
  exec /usr/xpg4/bin/sh - "$0" ${1+"$@"}
# ensure POSIX utilities
PATH=$(command -p getconf PATH; :)${PATH:+:}$PATH

That's for Solaris+systems with /bin/sh being POSIX. If another
system with a /bin/sh not being POSIX was to be supported, I
would simply have to adapt those lines a bit. But I wouldn't
have to rewrite the script as when you need to port to another
variant of the Bourne shell or utilities.

(the irony is that the two first lines of code above are not
POSIX conformant (#! and ^ are unspecified)).

-- 
St├ęphane




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