Incrementing variable=0 with arithmetic expansion causes Return code = 1

From	Gabriel Winkler <gabriel.winkler@bpm.ch>
Newsgroups	gnu.bash.bug
Subject	Incrementing variable=0 with arithmetic expansion causes Return code = 1
Date	2020-08-28 08:00 +0000
Message-ID	<mailman.1592.1598619821.2469.bug-bash@gnu.org> (permalink)
References	<GVAP278MB0118201C70D7FAF7B4DF612D98520@GVAP278MB0118.CHEP278.PROD.OUTLOOK.COM>

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Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc -I/home/abuild/rpmbuild/BUILD/bash-4.4 -L/home/abuild/rpmbuild/BUILD/bash-4.4/../readline-7.0
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64' -DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-suse-linux-gnu' -DCONF_VENDOR='suse' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL -DHAVE_CONFIG_H   -I.  -I. -I./include -I./lib   -fmessage-length=0 -grecord-gcc-switches -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector-strong -funwind-tables -fasynchronous-unwind-tables -fstack-clash-protection -g  -D_GNU_SOURCE -DRECYCLES_PIDS -Wall -g -Wuninitialized -Wextra -Wno-switch-enum -Wno-unused-variable -Wno-unused-parameter -Wno-parentheses -ftree-loop-linear -pipe -DBNC382214=0 -DIMPORT_FUNCTIONS_DEF=0 -fprofile-use -fprofile-correction
uname output: Linux sophie 4.12.14-150.32-default #1 SMP Thu Aug 1 08:42:52 UTC 2019 (a2a3983) x86_64 x86_64 x86_64 GNU/Linux
Machine Type: x86_64-suse-linux-gnu

Bash Version: 4.4
Patch Level: 23
Release Status: release

Description:
If I have a variable with the value 0 assigned to it incrementing it causes the return code to be 1, even though the variable has been incremented successfully. This only happens if the value of the variable is 0. With positive and negative values this bug is no present.

Repeat-By:
# Works fine
test=1
((test++))
echo $?
0
echo $test
2

# Causes error
test=0
((test++))
echo $?
1
echo $test
1


Best Regards

Gabriel Winkler

_________________________

bpm consult ag
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Gabriel Winkler
DevOps Engineer
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CH-4614 Hägendorf

Telefon +41 61 417 10 68
Web     www.bpm.ch<http://www.bpm.ch/>

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Incrementing variable=0 with arithmetic expansion causes Return code = 1 Gabriel Winkler <gabriel.winkler@bpm.ch> - 2020-08-28 08:00 +0000

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