In UN*X, executables do not have special extensions (like .com .exe). Programs are run by simply typing their name. If the program is in your search path the program will run.
During the execution of the program you will not be able to use the terminal on which you are running the program. This is because you are waiting for the program to finish. It is also possible to run a command in the background by simply appending a "&" to the end of the command name.
command &
If you have started running a program and wish to put it on the background, you can use CTRL-Z to suspend the execution, this will stop your program and return you to the command interpreter. Issue the command
bg
your program will start running in the background as if it was started with a "&" appended on the command line.
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