THIS IS OUT OF 24 POINTS!!!!  No one can get more than 24 points.

    EXEC STUFF
	1 Can run an executable.  I type in some full path, and you exec it.
		/bin/ls
	3 You search the path for the executable
		ls
	2 Can run commands in the background.
		processImage &
	2 Concatenate commands with &&.  Only runs next command if the previous command returned success.
		cd /home/rappleto && rm fred.txt
		
    REDIRECTION STUFF
	3 Can do file input redirection "<"
		wc < fred
	3 Can do file output redirection ">"
		ls > fred
	3 Can do file output redirection append mode ">>"
		ls >> fred
	5 Can do command piping "|"
		https://tldp.org/LDP/lpg/node11.html
		ls | wc
	+1 Can do lots of pipes
		ls | grep fred | wc
	1 Can do at least one combination of these things
		ls | wc > fred
	4 Can do every possible combination of three of <, >, and | 
		cat < filename | sort > sortedFile.txt
		
    ENVIORNMENT VARIABLE STUFF
	1 Can set enviornment variables
		(See https://www.greenend.org.uk/rjk/tech/putenv.html)
		PATH=:/bin:/sbin:/usr/sbin:/usr/bin
	1 Expands enviornment variables on the command line
		(Either manually or with wordexp)
		ls $HOME
	1 Change Prompt
	        PS1="what is you command?"
	        
    WORDEXP STUFF
	3 Does filename expansion "glob" 
		(Hint:  Use the built in glob, or really use wordexp.)
		http://www.gnu.org/software/libc/manual/html_node/Wordexp-Example.html
		http://euclid.nmu.edu/~rappleto/Classes/CS426/Assignments/TheBigAssignment/wordexp-example.cc
		ls a*b
	1 Replace "~" with the home directory
		(wordexp can do this too)
		rm ~/junkfile

    READLINE LIBRARY 
	1 Control-L clears the screen
	1 Tab Completion 
	1 Arrow History 
	1 Saves and reloads history to a file
	1 change what at least 2 keys do (so ^L deletes a char and ^p clears the screen for example)
	
    MISC
	1 Knows how to change directory
		(See chdir)
		cd /fred
	1 Catch Keyboard interrupt
		(See https://www.geeksforgeeks.org/signals-c-language/)
	        ctrl + c = back to prompt
	        Make sure you have a working quit/exit command first!
	1 or 5 When they misspell a command, offer a suggestion
		(user) lss
                (shell) Did you mean "ls"?
                One point is you do something with five lines of code and an array
                Five points involves actually seeing which executables exist
	2 Can run commands from a file
		. scriptFile.txt
	1 Bang last command that starts with some letter.
		Assuming in the past you ran 'rm'.
	        !r runs rm
	1 Bang # command
	        !4 runs 4th command from history
	1 Queue commands
	        make ; make install
	1 Can have lots of semicolons
		ls; sleep 3; rm fred
	2 Automatically runs a file called .myshell when it starts
	+1 Turned in 1 day early (Thursday)
	+2 Turned in 4 days early (Monday)
	-2  Commands cannot have arguments (i.e. ls -l does not work).
    
	


Some cases to consider
	A person tries to run a non-executable.
	A person tries to read or write to a non-existant file.
	A person tries to read or write to a file they do not have permissions on.
	A person tries a non-sensical command. (i.e. ls > foo > fee < doo < dee
	A person tries to pipe to a non-command (i.e. ls | /tmp/foo.txt)
	A person tries to pipe from a non-command (i.e. /tmp/foo | ls)
	A person tries to expand a non-variable (i.e. ls $DOES_NOT_EXIST)
	A regular expression matches no files.
	A regular expression matches one file.
	A regular expression matches lots of files.
	A person tries to change directory to something that does not exist.
		
These programs are due the last day of class.  It will take a totally 
excellent excuse to move this at all.