Anonymous committed 055467d

CodingGuidelines: spell Arithmetic Expansion with $(($var))

POSIX wants shells to support both "N" and "$N" and requires them to yield
the same answer to $((N)) and $(($N)), but we should aim for portability
in a case like this, especially when the price we pay to do so is so
small, i.e. a few extra dollars.

Signed-off-by: Junio C Hamano <>

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Files changed (1)


  - We use Arithmetic Expansion $(( ... )).
+ - Inside Arithmetic Expansion, spell shell variables with $ in front
+   of them, as some shells do not grok $((x)) while accepting $(($x))
+   just fine (e.g. dash older than 0.5.4).
  - No "Substring Expansion" ${parameter:offset:length}.
  - No shell arrays.