Final answer:
The command to view the process register on Unix-like operating systems is the 'ps' command, which stands for 'process status.' 'dir' and 'ls' are commands for listing directory contents in different operating systems, not for viewing processes.
Step-by-step explanation:
To view the process register or the current processes on a Unix-like operating system, you can use the ps command. This command displays information about active processes. It stands for 'process status.' The ps command can be used in various ways to show different levels of detail about the processes running on a system. On the other hand, the dir command is used in DOS and Windows to list the contents of a directory, and the ls command is used in Unix-like systems for a similar purpose. Neither of the latter commands is used to view processes.