if ";"
	do all the stuff on the before
	do all the stuff on the after
	


fork
if kid

	for each arg
		if arg starts with "$"
			replace with getenv(that arg without $)
			
		if arg is ">"
			fdout = open for writing
			error check
			remove 2 args from the list
			dup2(fdin, 0);
		if arg == "<"
			fdout = open for writing
			error check
			remove 2 args from the list
			cerr < "I love cheese\n";
			dup2(fdout, 1);
			
		if arg is a "|"
			pipe
			fork()
			if kid2  "ls"
 				close pipefd[0]
				dup2(pipefd[1]  , 1)
				exec stuff
			if parent "wc"
				close pipefd[1]
				dup2(pipefd[0]  , 0)
				exec stuff
				
				
	
	build the args list
	

	for p in PATH
		exec
	print pancakes
	exit(3)





















void error(char *msg, bool flag)
{
	if (flag)
	{
		perror(msg);
		exit(1);
	}
}


fd = open("fred.txt, O_RDONLY);
error("Bad oipen", fd == -1);


error("Bad open", fd = open("fred.txt", O_RDONLY) == -1);





fd = open("fred.txt", O_RDONLY);
if (fd == -1)
{
	perror("crying");
	exit(4);
}