Using Ophcrack from da command line

First off, you need some rainbow tables (Get the ophcrack tables to avoid compatibility issues) from http://ophcrack.sourceforge.net/tables.php.

You can also get the ophcrack program from that site as well.
I will be using BT4 which already has the ophcrack preinstalled.

unzip the rainbowtables into a folder.
Note: This here assumes you have your password hashes in the proper format as well. Programs such as pwdump6 and fgdump are good ones that produce compatible output for use with ophcrack.

command:
# ophcrack -g -d path_to_rainbow_tables_dir/ -t path_to_rainbow_tables_dir/ -n 4 -f hashes.txt

'-d' - Path to rainbow tables
'-g' - do no run the GUI interface
'-t' - specify which table to use. Just putting the dir path to the table works for me
'-n' - number of threads to use
'-f' - path to hashes file obtained from programs like fgdump or pwdump


Of course you can always use the GUI by just typing 'ophcrack' from the command line.