Accepted answer

you've more or less figure out the first error yourself. when you just run <filename> , it is not in your path environment variable, so you get "command not found". you have to give a full or relative path when to the program in order to run it, even if you're in the same directory as the program - you run it with ./<filename>

when you do run your program, it appears to just exit as soon as you start it - we can't help much with that without knowing what the program does or see some code.

you can do some debugging, e.g. after the program just exits run echo $? to see if it exited with a particular exit value, or run your program using the strace tool to see what it does (or do it the usual way, insert printf debugging, or debug it with gdb)

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