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Unpatched Tru64 5.1 sh omits the last slash of command-line arguments that contain two trailing slashes:
$ echo / // /// //// .// //. / / // /// ./ //. $ x=// $ eval "echo \$x" / $ set -x $ echo abc | tr -t ab // + echo abc + tr -t ab / /bc
However, our understanding is that patches are available, so perhaps it's not worth worrying about working around this horrendous bug.