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From: Eli Schwartz <eschwartz@archlinux.org>
Newsgroups: gnu.bash.bug
Subject: Re: possible bug in Bash 5.0
Date: Wed, 25 Dec 2019 23:31:43 -0500
Lines: 95
Approved: bug-bash@gnu.org
Message-ID: <mailman.1440.1577334721.1979.bug-bash@gnu.org>
References: <482a982b-c02b-65a3-68c5-e4c0e1f62874@uni-paderborn.de> <2351f424-162e-11ad-e762-d9fb2786f491@archlinux.org>
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On 12/25/19 5:41 PM, Xin Wu wrote:
> Hi,
>=20
> I found the single-bracket [ ... ] and double-bracket [[ ... ]] behave
> differently for string comparison in the follow simple Bash-script.
>=20
> # comma (,) is before two (2) in ASCII
> a=3D,rst
> b=3D2rst
> if [ "$a" \> "$b" ]; then
> =C2=A0 echo "single-bracket"
> fi
> if [[ "$a" > "$b" ]]; then
> =C2=A0 echo "double-bracket"
> fi
>=20
> According to some web pages I was expecting that single-bracket and
> double-bracket should give same result. I'm not a Bash-expert, therefor=
e
> I'm not sure whether this is a real bug in Bash 5.0.
>=20
> Merry Christmas!
>=20
> Xin
>=20
> PS: the web pages are:
>=20
> * http://tldp.org/LDP/abs/html/comparison-ops.html
> * http://tldp.org/LDP/abs/html/refcards.html
> * http://mywiki.wooledge.org/BashFAQ/031

On the last of these three web pages is the note:

"As of bash 4.1, string comparisons using < or > respect the current
locale when done in [[, but not in [ or test. In fact, [ and test have
never used locale collating order even though past man pages said they
did. Bash versions prior to 4.1 do not use locale collating order for [[
either."

Try using the C locale, for example: LC_COLLATE=3DC

Then see what the double brackets does.

--=20
Eli Schwartz
Arch Linux Bug Wrangler and Trusted User


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