oclHashcat on desktop apu and decryt

[m_del_buon]

i would like to know which is the correct command line for decrypt a sha512 hash file

Code:

./oclHashcat-1.36/oclHashcat64.bin -m 1800 -a 3 -o found file.hash --force -i ?a?a?a?a?a?a ?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a --powertune-enable

searching for plain text that is between 6 and 15 with no more thant 3 subsequent similar chars . thanks for help in forward.