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recho "A${*:-w}R" recho "A${*-w}R" recho "A${*}R" set -- "" recho "A${*:-w}R" recho "A${*-w}R" recho "A${*}R" set -- $'\177' recho "A${*:+w}R" recho "A${*+w}R" recho "A${*}R" recho A${*:+w}R recho A${*+w}R recho A${*}R