What happens when a program name is typed on the command line?

I mean I know what HAPPENS but I need to know the sequence of events. How would I describe it?
i.e. java MyProg

What is this? Are you taking a take-home exam on basic computer operation? You're asking very similar questions about broad things.
Anyway:
1) the shell parses the command line. it gets a sequence of tokens which are basically just individual strings
2) the shell identifies which tokens on the command line are executables, and which are arguments to those executables. It also figures things out like how to chain the output of one program to the input of another, although this doesn't apply in the example you gave. In your example, "java" is the executable and "MyProg" is a string to pass to the executable as an argument.
3) The shell then searches for the actual program file corresponding to the token that refers to an executable. The shell looks at the PATH environment variable to find a list of directories; it then looks in each directory until it finds the program file. So the program file here would be "java.exe" on a windows system.
4) It then spawns off a new process to run the java program, passing the MyProg string to it as an argument.
Does that help?

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Best regards
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Från: Neo Rye [email protected]
Skickat: den 28 november 2012 06:44
Till: Lennart Risfelt
Ämne: what happens when you get a "PermGen space null" error?
Re: what happens when you get a "PermGen space null" error?
created by Neo Rye<http://forums.adobe.com/people/Neo+Rye> in ColdFusion - View the full discussion<http://forums.adobe.com/message/4879436#4879436

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What happens when a program name is typed on the command line?

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