[TUHS] another OSX 100% less Unix

[Peter Yardley]

OSX is Mach which has a BSD emulation layer. And BSD injected into the kernel.

It doesn’t claim to be UNIX.

> On 27 Jun 2024, at 1:29 PM, ron minnich <rminnich at gmail.com> wrote:
> 
> I have a directory, t:
> ronsexcllentmbp:t rminnich$ ls -li
> total 0
> 23801442 -rw-r--r--  1 rminnich  wheel  0 Jun 26 20:21 a
> 23801443 -rw-r--r--  2 rminnich  wheel  0 Jun 26 20:21 b
> 23801443 -rw-r--r--  2 rminnich  wheel  0 Jun 26 20:21 c
> 
> note that b and c are the same inode.
> 
> let's make a cpio.
> 
> ronsexcllentmbp:t rminnich$ cpio -o >../t.cpio
> a
> b
> c
> ^D
> 1 block
> 
> what's in it?
> ronsexcllentmbp:t rminnich$ cpio -ivt < ../t.cpio
> -rw-r--r--   1 rminnich wheel           0 Jun 26 20:21 a
> -rw-r--r--   2 rminnich wheel           0 Jun 26 20:21 b
> -rw-r--r--   2 rminnich wheel           0 Jun 26 20:21 c link to b
> 
> "c link to b"? wtf? Who thought that was a good idea? because ...
> ronsexcllentmbp:t rminnich$ touch 'c link to b'
> ronsexcllentmbp:t rminnich$ ls -l
> total 0
> -rw-r--r--  1 rminnich  wheel  0 Jun 26 20:21 a
> -rw-r--r--  2 rminnich  wheel  0 Jun 26 20:21 b
> -rw-r--r--  2 rminnich  wheel  0 Jun 26 20:21 c
> -rw-r--r--  1 rminnich  wheel  0 Jun 26 20:22 c link to b
> 
> and
> ronsexcllentmbp:t rminnich$ cpio -o >../t.cpio
> a
> b
> c
> c link to b
> ^D
> 
> ronsexcllentmbp:t rminnich$ cpio -ivt < ../t.cpio
> -rw-r--r--   1 rminnich wheel           0 Jun 26 20:21 a
> -rw-r--r--   2 rminnich wheel           0 Jun 26 20:21 b
> -rw-r--r--   2 rminnich wheel           0 Jun 26 20:21 c link to b
> -rw-r--r--   1 rminnich wheel           0 Jun 26 20:22 c link to b
> 
> so ... it looks like a file is there twice, because somebody thought it was a good idea to confuse a file name and file metadata. And, anyway, it's just as accurate to have it say
> -rw-r--r--   1 rminnich wheel           0 Jun 26 20:21 a
> -rw-r--r--   2 rminnich wheel           0 Jun 26 20:21 b link to c
> -rw-r--r--   2 rminnich wheel           0 Jun 26 20:21 c link to b
> -rw-r--r--   1 rminnich wheel           0 Jun 26 20:22 c link to b
> Right? :-)
> 
> From the same people who brought you this:
> ronsexcllentmbp:t rminnich$ bc
> >>>
> 
> Somebody needs to get the osx folks a unix manual set :-)

Peter Yardley
peter.martin.yardley at gmail.com