How to copy and paste a file?

Use the cp command to copy a file, the syntax goes cp sourcefile destinationfile. Use the mv command to move the file, basically cut and paste it somewhere else.

The exact syntax you would use for your example is:

sudo cp /usr/bin/octave/3.2.4/m/miscellaneous/mkoctfile.m /usr/bin/mkoctfile-3.2.4

For more information on the cp or mv commands you can run:

man cp

or

man mv

To view the manual pages