There is one difference:

If you don't check for errors, errors (incl non-existent files) being returned by -s will be mistaken as empty file.

If you don't check for errors, errors (incl non-existent files) being returned by -z will be mistaken as non-empty file.

In reply to Re^3: -s testing for empty file; works on local, but not on remote by ikegami
in thread -s testing for empty file; works on local, but not on remote by Jeri

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