If I have a program written in C, how can I run this program in a terminal with just a single word (the program's name), no matter where it is on the system?
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See this:
http://www.linfo.org/path_env_var.html
As Pilot6 and Serg wrote in comment, You have to expand your $PATH
system variable and compile program in release mode. When you will have this done, you will call myProgram
and your system should check if it exists ind $PATH
directories; it will eventually run it if it exists, or show error "unknown command" if it doesn't.

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$PATH
variable, as Pilot6 properly said. See this http://askubuntu.com/q/60218/295286 – Sergiy Kolodyazhnyy Aug 03 '16 at 14:36