Assignment #$3$ Process Communication

Will introduce inter process communication and redirection. We will use pipe$()$ and dup$()/$dup$2().$

More information about dup$()$ and dup$2()$

More information about pipe$()$

The assignment is to pipe output from the child to the parent. You can choose whichever output you like, but the standard "Hello World" would be sufficient. Your program should:

$,$ Check to verify the fork was created $(15\%)$

Prompt for arguments from the user. There are two arguments that you will need to create $(-$o and $-$b$)$; however, they are optional. To prove that the fork works, your program should print "Hello World", in either the standard terminal, the output.txt file, or both. $(15\%$ for the prompt$)$

For $-$o$,$ output is redirected to the file output.txt only.

For $-$b$,$ output is redirected to the file output.txt and the terminal

If no arguments are given, standard output to the terminal

Use one of the optional arguments $(-$o or $-$b$)$ for an extra $20\%$ on your $A3!$

Execute the command without any errors $(20\%)$

$,$ Pipe the output from the child to the parent process $(20\%)$

Successfully redirect the parent process output to the correct location $(30\%)$

If you send output to the output.txt$,$ file:

If output.txt does not exist, then your application should create it$.$

If output.txt does exist, then the file should be truncated and over written.