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Re: Incrementing variable=0 with arithmetic expansion causes Return code


From:
Subject: Re: Incrementing variable=0 with arithmetic expansion causes Return code = 1
Date: Fri, 28 Aug 2020 14:09:05 +0100
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.2.0

On 28/08/2020 09:00, Gabriel Winkler wrote:
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

This isn't a bug. You should write ((++test)) if you want the post-incremented value to be evaluated.

--
Kerin Millar



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