Re: [LTP] [PATCH 0/4] Replace commonly used perl tools with awk equivalents

[Mike Frysinger <vapier@gentoo.org>]

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On Wednesday 04 April 2012 13:31:10 Garrett Cooper wrote:
> On Wed, Apr 4, 2012 at 10:22 AM, Mike Frysinger <vapier@gentoo.org> wrote:
> > On Wednesday 04 April 2012 01:23:43 Garrett Cooper wrote:
> >> The intent behind these changes are to remove unnecessary perl
> >> dependencies in LTP by using awk in its stead. It was something that was
> >> discussed a while ago on ltp-list@.
> > 
> > i like awk over perl a lot.  my only concern is non-POSIX stuff slipping
> > in (such as people who have gawk installed).  should we add a local
> > wrapper script that sees if the awk accepts a --posix flag and
> > automatically pass it ?
> 
> That's actually a gawk-ism :)...

yes, that's why i phrased it "if the awk accepts"

awk --help | grep -q -e --posix && args="${args} --posix"

> Seeing how Android and some other Linux distros like borrowing bits
> and pieces from BSD, I think that using --posix might not guarantee
> much (on the bright side it doesn't error out either with 'the
> one-true-awk'):

perhaps, but gawk provides a lot of useful funcs that i know i use that aren't 
in POSIX, and we want to make sure these things don't slip in.  telling people 
"make sure you test with XXX awk" is certain to be error prone.

plus, there are certain edge conditions which are very subtle.  consider the 
handling of substr() and the starting position of "0":
	echo abc | mawk '{print substr($0, 0, 2)}'  -> a
	echo abc | gawk '{print substr($0, 0, 2)}'  -> ab
	echo abc | mawk '{print substr($0, 1, 2)}'  -> ab
	echo abc | gawk '{print substr($0, 1, 2)}'  -> ab

> I understand the goals, but looking at the manpage on opengroup and
> through one-true-awk's source, there's nothing consistent that
> guarantees that POSIX is adhered to in awk (but there probably should
> be a flag, environment variable, etc).

POSIX should be the LCD we work with without accidentally using something that 
is specific to a single awk
-mike

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