>> I accidently typed cd // on one of my slackware 7.0 boxes.
>> Surprisingly it happily took me to //, which seems to be an alias for the /
>> directory.
Two leading slashes leads to implementation-defined behaviour, per POSIX.
That's why bash leaves them alone. Three or more leading slashes are
equivalent to a single one.
So don't use two leading slashes in your scripts if you want to be portable,
but you can use two slashes (as another way of writing a single slash) when
they're in the middle or at the end.
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