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bug in arithmetic expansion


From: Joern Knoll
Subject: bug in arithmetic expansion
Date: Sat, 9 Nov 2019 11:52:56 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0

Hallo,

in playing around with digital keys (integers) which have a simple arithmetic check property, I encountered problemsusing bash's arithmetic expansion, when ever the used digital substrings have leading zeros. The problem shows up already for the simplest operations, namely converting a string argument to its numerical value, as shown below.

With thanks for your attention and best regards, Jörn Knoll

[tplx99]:/the/knoll > echo $((0123))
83
[tplx99]:/the/knoll > echo $((123))
123
[tplx99]:/the/knoll > echo $((01234))
668
[tplx99]:/the/knoll > echo $((1234))
1234


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