possible bug in Bash 5.0

From	Xin Wu <xin.wu@uni-paderborn.de>
Newsgroups	gnu.bash.bug
Subject	possible bug in Bash 5.0
Date	2019-12-25 23:41 +0100
Message-ID	<mailman.1436.1577325994.1979.bug-bash@gnu.org> (permalink)
References	<482a982b-c02b-65a3-68c5-e4c0e1f62874@uni-paderborn.de>

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Hi,

I found the single-bracket [ ... ] and double-bracket [[ ... ]] behave differently for string 
comparison in the follow simple Bash-script.

# comma (,) is before two (2) in ASCII
a=,rst
b=2rst
if [ "$a" \> "$b" ]; then
   echo "single-bracket"
fi
if [[ "$a" > "$b" ]]; then
   echo "double-bracket"
fi

According to some web pages I was expecting that single-bracket and double-bracket should give same 
result. I'm not a Bash-expert, therefore I'm not sure whether this is a real bug in Bash 5.0.

Merry Christmas!

Xin

PS: the web pages are:

* http://tldp.org/LDP/abs/html/comparison-ops.html
* http://tldp.org/LDP/abs/html/refcards.html
* http://mywiki.wooledge.org/BashFAQ/031

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possible bug in Bash 5.0 Xin Wu <xin.wu@uni-paderborn.de> - 2019-12-25 23:41 +0100

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