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Single quote character not handled well in associative array index


From: Jarno Suni
Subject: Single quote character not handled well in associative array index
Date: Tue, 30 Aug 2016 00:57:12 +0300

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64'
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-pc-linux-gnu'
-DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash'
-DSHELL -DHAVE_CONFIG_H   -I.  -I../. -I.././include -I.././lib
-Wdate-time -D_FORTIFY_SOURCE=2 -g -O2 -fstack-protector-strong
-Wformat -Werror=format-security -Wall
uname output: Linux jarno-hp8510w 4.4.0-31-generic #50-Ubuntu SMP Wed
Jul 13 00:07:12 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
Machine Type: x86_64-pc-linux-gnu

Bash Version: 4.3
Patch Level: 46
Release Status: release

Description:
Using associative array variable that has a single quote in index does
not work withing (( )) without a trick.

Repeat-By:
declare -A a
b="80's"
((++a[$b]))
((++a["$b"]))
[[ $((++a[$b])) ]] || true
[[ $((++a["$b"])) ]] || true  # this finally works and makes the variable =1
echo ${a["$b"]}
echo ${a[$b]}



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