cap files into hash or hex help

[cpu_man81]

any body can teach me how to get hash file i have a cap file but i can hash it.........im using The-Distribution-Which-Does-Not-Handle-OpenCL-Well (Kali) linux latest...ill perfectly using command airodump-ng to capture a file i use wordlist ang pentest but im field?

[magnum]

http://hashcat.net/wiki/doku.php?id=cracking_wpawpa2