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From: "Leif Lindholm" <leif.lindholm@linaro.org>
To: Rebecca Cran <rebecca@bsdio.com>
Cc: devel@edk2.groups.io, lersek@redhat.com, bob.c.feng@intel.com,
	liming.gao@intel.com, michael.d.kinney@intel.com,
	afish@apple.com
Subject: Re: [edk2-devel] [PATCH 1/1] edksetup.sh: rework python executable scanning
Date: Wed, 17 Jul 2019 15:04:51 +0100	[thread overview]
Message-ID: <20190717140451.GB2712@bivouac.eciton.net> (raw)
In-Reply-To: <08f3b643-0622-7db4-ad28-e1145f053384@bsdio.com>

On Tue, Jul 16, 2019 at 02:10:43PM -0600, Rebecca Cran wrote:
> On 2019-07-16 13:07, Leif Lindholm wrote:
> > +        EXECUTABLE=`basename $file`
> > +        VERSION=`echo $EXECUTABLE | sed 's/[^0-9.]//g'`
> > +
> > +        MAJOR=`echo $VERSION | sed 's/\([0-9]*\)\.*.*/\1/'`
> > +        MINOR=`echo $VERSION | sed 's/[0-9]*\.*\([0-9]*\).*/\1/'`
> > +        PATCH=`echo $VERSION | sed 's/[0-9]*\.*[0-9]*\.*\([0-9]*\)/\1/'`
> 
> Here and in other places, we should probably use $(...) instead of `...` .
> 
> From http://mywiki.wooledge.org/BashFAQ/082 :
> 
> " `...` is the legacy syntax required by only the very oldest of
> non-POSIX-compatible bourne-shells. There are several reasons to always
> prefer the $(...) syntax..."
> 
> And https://wiki.bash-hackers.org/scripting/obsolete

I also liked http://mywiki.wooledge.org/BashFAQ/082, linked from that.

> "Both the |`COMMANDS`| and |$(COMMANDS)| syntaxes are specified by
> POSIX, but the latter is _greatly_ preferred, though the former is
> unfortunately still very prevalent in scripts."

You're absolutely right.

I have in the past written scripts both for ancient UNIXen and early
busybox, so have a habit to go lowest common denominator. But this is
a _bash_ script, so there's no good reason.

If we keep the function, I'll rewrite it as suggested - thanks!

/
    Leif

  reply	other threads:[~2019-07-17 14:04 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-16 19:07 [PATCH 1/1] edksetup.sh: rework python executable scanning Leif Lindholm
2019-07-16 20:10 ` [edk2-devel] " rebecca
2019-07-17 14:04   ` Leif Lindholm [this message]
2019-07-16 20:49 ` Laszlo Ersek
2019-07-16 22:04   ` Leif Lindholm
2019-07-17  3:23     ` Liming Gao
2019-07-17 10:21       ` Laszlo Ersek
2019-07-17 14:32         ` Liming Gao
2019-07-17 19:43           ` Laszlo Ersek
2019-07-17 22:37       ` Leif Lindholm
2019-07-18 16:48         ` [edk2-devel] " Liming Gao
2019-07-18 17:55           ` Leif Lindholm
2019-07-19 13:07             ` Liming Gao
2019-07-23  9:44               ` Leif Lindholm
2019-07-24 15:29                 ` Liming Gao
2019-07-17 10:13     ` Laszlo Ersek

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