On May 9,  6:50pm, kre@munnari.OZ.AU (Robert Elz) wrote:
-- Subject: Re: pkg/36257 (games/wesnoth has msgfmt problems (plurals) [NetBS

|  Aside from cases where you can rewrite things to simplify and avoid
|  a logical operator completely, the only reason to avoid -a and -o 
|  (using && and || instead) is to avoid strangeness in implementations of
|  test.   If you were confident that test whatever -a whatever_else
|  would have the same effect (always) as test whatever && test whatever_else
|  then using the former would always be better - even where test is built
|  into the shell, it means less work, and also allows test to cache stat
|  results (in expressions like "test -b x -o -c x").

You can always use parentheses:

    test \( -b x \) -o \( -c x \)

I always use parentheses with -a and -o and have not encountered
a test implementation that does not work properly.

christos