From MEPIS Documentation Wiki
The application is available from the repos for MEPIS 8 onward through Synaptic/Apt.
The essential syntax is simple, just type as root:
ddrescue <drive one> <drive two>
For details, look at the man page; in MEPIS 8.5, right-click the desktop > Run Command, and type in man:ddrescue. Full documentation can be had by pasting info:/ddrescue to the location line in your file manager. Or you can type at command line:
Note that you may have to install the command info first.