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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
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