Public bug reported:
It seems that arithmetic expansion is completely broken in dash
0.5.51-3ubuntu2 from 10.04.3 LTS:
% /bin/sh -c 'echo $((10-2-3))' # ok so far
5
% /bin/sh -c 'echo $((10-2*0-3))' # what??
13
% /bin/sh -c 'echo $((10-2*1-3))' # it's not limited to factor being 0
neither
11
This can be worked around by using additional parentheses, e.g.
% /bin/sh -c 'echo $(((10-2*1)-3))'
5
FWIW the bug doesn't exist in dash 0.5.7-2 from Debian but I can't find
any mention of it being fixed in dash change log so I'm not sure whether
it's a dash bug or something Ubuntu-specific.
** Affects: dash (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/932067
Title:
Minus associativity not correct in arithmetic expansions
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