Hi Ian,

On Thu, 17 Jun 2021 11:42:13 -0700 Ian Rogers [off-list ref] wrote:

$(( .. )) is a bash feature but the test's interpreter is !/bin/sh,
switch the code to use expr.

The $(( .. )) syntax is specified in POSIX (see
https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_06_04),
so unless this caused an actual problem, this change is unnecessary.

-- 
Cheers,
Stephen Rothwell