Re: cmp doesn't accept directories

[Eric Blake]

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According to Dan Jacobson on 5/20/2006 12:36 AM:
> $ diff ntodo.txt /mnt/usb/cf/fromjidanni1/
> $ cmp ntodo.txt /mnt/usb/cf/fromjidanni1/
> cmp: /mnt/usb/cf/fromjidanni1/: Is a directory
> 
> Could make it like diff.

Actually, POSIX is probably buggy here, since it does not explicitly
exclude input files being directories.  It states that results are
undefined if the two input files are both stdin, the same FIFO, block, or
character special file; but does not have any restrictions about
directories.  But how is cmp supposed to tell you which byte differs on a
directory?  We probably need to raise a defect with the Austin group.

- --
Life is short - so eat dessert first!

Eric Blake             address@hidden
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