OSX hash

[Mem5]

Hi guys,

I don't know where to post my question so I hope it is OK here.
My question deals about OSX hashes.
I read that a OSX hash is a salted SHA1 (salt = first 8 chars)

Code:

OSX_hash : <removed>
salt : <removed>
sha1 : <removed>

oclhashcat gives me "password" as clear.
I would like now to generate the hash corresponding to this plain text, just to double-check.

But if a do echo -n password | sha1sum it does not give me the expected hash.

How can I generate an OSX hash when knowing the clear ?

Thank you.