Sample code to accompany slides on writing a shell.
These samples involve using file redirection and pipes.

Makefile:    	make file for all programs, just type "make"

logusers.c:	Output redirection, program execs who and saves
                  output in a log file.	

peterpiper.c:	Single process that creates a pipe, writes to it
		and then reads from it.

pipesize.c:	Program that writes to a pipe continuously.
		This program will eventually get hung (when it 
		reaches the capacity of the pipe). ^C to kill it.

sortedls.c:	creates a pipeline, basically: "ls | sort"

sortfile.c	uses file input redirection, arranges it so that
                sort reads from a file.