Paul Knight wrote:
> On May 19, 2006, at 12:43 AM, Alex Young wrote:
> 
>> Dave Burt wrote:
>>
>> On unices, I think this does the trick:
>>
>>   $ df -h `mount | grep '^/dev' | cut -f 3 -d ' '`
>>
>> Works on Linux and OS X, certainly - I don't have any other BSDs to  
>> check.
> 
> It should work on most modern *nix systems, but `df -h` isn't
> available on Solaris 8 and older. Incidentally, this was one of my
> favorite changes in Solaris 9.
> 
> Paul Knight

I found a ruby version of df a long time ago. It did a syscall(99), so 
if this syscall is a standard POSIX one then the script should work on 
all posix compliant os-es
The relevant part:
      size = 64
      unpack_fmt = 'iiiiiiiiiiiiiiii'
      foo = ' ' * size
      syscall(99, hd[1], foo)
      type, @bsize, @blocks, @bfree, @bavail, @files, @ffree, 
tmp,tmp,@namelen = foo.unpack(unpack_fmt)
      usage=100*(@blocks-@bfree)/@blocks






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