[ -d ' ' ] && echo yes

[Norton Allen]

Inasmuch as such a directory does not exist, this should
not give any output:

  [ -d ' ' ] && echo yes

I suspect this is not a feature of bash, but more deeply
buried, since

  ls -ld ' '

believes ' ' is a directory and

  ls -la ' '

will give you 'total 0' (no . or .. entries).
It also believes any name consisting of all spaces is
a directory.

On the plus side, you can't create a real directory or
file named ' ', because it thinks one already exists.

  -Norton Allen
  

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