init

README.md

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+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.  
+
+
+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 input redirection "<"
+        ls > fred
+    + 1 Can do file output redirection ">"
+        ls < 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
+        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
+            !l runs ls
+    + 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 Automatically runs a file called .myshell when it starts
+    + 2 Only runs execuatables from an approved list
+    + -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.