Commands that are too long to display on a printed page are shown with "\" characters at the ends of intermediate lines:

cfx5export -cgns [-boundary] [-corrected] [-C] \ 
 [-domain <number>] [-geometry] [-help] [-name <file>] \
 [-summary] [-timestep <number>] [-user <level>] [-norotate] \
 [-boundaries-as-nodes|-boundaries-as-faces] [-verbose] <file>

On a Linux system, you may type the "\" characters, pressing Enter after each. However, on a Windows machine you must enter the whole command without the "\" characters; continue typing if the command is too long to fit in the command prompt window and press Enter only at the end of the complete command.