The -a and -o operators of test(1) have been marked obsolescent for a while now; see link below. However, while the HTML manual is updated, the current man page, still my primary source of reference, is missing a hint to that:

http://linux.die.net/man/1/test

See also

http://pubs.opengroup.org/onlinepubs/9699919799/utilities/test.html#tag_20_128_16

Martin



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