Many thanks for replies and support for the newcomer to GIMPS I am.
I would like to suggest the above information be explicitly included in the available information and documentation on mprime. It may seems obvious to the experience user but for the newcomer it would very useful. I would suggest the following text:
"If at any time during mprime calculations there is a need to either shutdown or reboot the computer, mprime calculation can be resumed by manually starting again mprime with no option in the subdirectory where the previous calculations where done. For instance in Linux at the terminal prompt type:
./mprime m (initial start of mprime calculations)
Answer the questions
After reboot, only type ./mprime. (restart and continuation of previous calculations)
or as suggested above include in the cronjob list @reboot.
