Newbie question - Recover associated hex string of SHA1 hash

[robertico_rdk]

I'm a newbie and I've a question about using oclHashcat.
I don't know whether it is suitable for what I want to achieve

I've a SHA1 hash value and want to find the associated hexadecimal string.

Example:
The hex string to retrieve is: AB0EFFB8
The SHA1 value is: 054b71ba03578aa5b476b3d3af663b3180cecc59

Is it possible to use oclHashcat and if so, what's the best command line to use.
(Should hash value lower or uppercase)

Any help is greatly appreciated.