If you use more than 3 lines of code from the internet, cite them in a comment.
It's cause for an 'f' otherwise!!!!


THIS IS OUT OF 20 POINTS!!!!  No one can get more than 20 points.

If you work in pairs, then I'll give each person 2/3 of the total points.  So
if a team gets 30 (and each person gets 15), I'll give each student 20.


If you work in threes, then I'll give each person 1/2 of the total points.  So
if a team gets 40 (and each person gets 13.3333), I'll give each student 20. 

You may not use the system() command.
YOu may not use the getenv command to get the PATH variable.  You may use it otherwise. 


The Shell Assignment (total 42 points)
	1 Can run an executable
		/bin/ls
	1 You search the path for the executable
		ls
	1 Can do file output redirection "<"
		ls > fred
	1 Can do file input redirection ">"
		cat < fred
	2 Can do command piping "|"
		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 any combination of three of <, >, and | 
		cat < filename | sort > sortedFile.txt
	2 Can set enviornment variables with your own code
		PATH=:/bin:/sbin:/usr/sbin:/usr/bin
	1 Can set enviornment variables with using putenv/setenv
		PATH=:/bin:/sbin:/usr/sbin:/usr/bin
	2 Expands enviornment variables on the command line
		ls $HOME
	2 Does filename expansion "glob" (Hint:  Use the built in glob.)
		ls a*b
	1 Knows how to change directory
		cd /fred
	1 Bang last command 
		Runs the last command that started with that letter
	        !r runs rm (the last command that started with an 'r')
	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 Change Prompt
	        PS1="what is you command?"
	3 Can run commands in the background.
		processImage &
	1 Concatenate commands with &.  Only runs next command if the previous 
	  comand returned success.
		cd /home/rappleto & rm fred.txt
	1 Catch Keyboard interrupt
	        ctrl + c = back to prompt
	1 Replace "~" with the home directory
		rm ~/junkfile
	1 Control-L clears the screen
		ctrl-l = clear screen
	3 When they misspell a command, offer a suggestion
		(user) lss
                (shell) Did you mean "ls"?
	2 Can run commands from a file
		. scriptFile.txt
	2 Tab Completion and Arrow History
	1 Saves and reloads history to a file
	2 Aliases work.
		alias dir=ls
	2 Automatically runs a file called .myshell when it starts
	2 Only runs execuatables from an approved list
	1 Prompt has hostname or username.
	-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 Friday before finals week.  It will take a totally excellent excuse to move this at all.