UNIX COMMANDS
-------------
* WARNING: UNIX is case senstive!!!

[] - Indicates an optional component.

mkdir - Makes a directory
      - mkdir path-to-desired-new-direcory
      - Example1 (to make a directory called JUNK):
         mkdir JUNK     
      - Example2 (to make a sub-directory SYS under directory JUNK):
         mkdir JUNK/SYS 

* Note: You can only make sub-directories after you've made the         
        directory.

rmdir - Removes a directory
      - rmdir path-to-direcory-to-remove
      - Example1 (to remove the JUNK sub-directory SYS):
         rmdir JUNK/SYS  
      - Example2 (to remove the directory JUNK):
         rmdir JUNK

* Note: You can only remove a directory after you've removed the 
        sub-directories.
* Note: The directory must also be empty before it can be removed
	  (see rm below).

cd - Changes or moves you to a directory
   - cd path-to-desired-direcory
   - Example1 (to move to the JUNK directory):
      cd JUNK     
   - Example2 (to move to the JUNK sub-directory SYS):
      cd JUNK/SYS 
   - Example3 (to move "back" 1 directory):
      cd ..
   - Example4 (to move "back" 2 directories):
      cd ../..

ls - Displays the contents of a directory on the screen.
    - ls [option] [path] [filename(s)]
    - Example1 (to list the current directory's contents):
       ls
    - Example2 (to list the contents of the JUNK directory):
       ls JUNK
    - Example3 (to list all ".exe" files in the JUNK directory):
       ls JUNK/*.exe

* Note: The options include -a (all files listed, including hidden files),
-l (all file data, long display), and others.







cp - Copies a file from 1 location or filename to another.
   - cp path1/file1 [drive:]path2/file2
   - Example1 (to copy a file from the JUNK directory to the SYS 
     directory)
      cp JUNK/hw1.txt JUNK/SYS/hw1.txt
   - Example2 (to copy a file from the JUNK directory to the SYS 
     directory and to use a different filename)
      cp JUNK/hw1.txt JUNK/SYS/hwa.txt
   - Example3 (to copy a file to another file, if you are in the 
     directory already)
      cp hw1.txt hwa.txt
   - Example4 (to copy a file to another file)
      cp JUNK/hw1.txt JUNK/hwa.txt

mv - Moves a file from 1 location/name to another.
   - mv path1/file1 path2/file2
   - Example1 (to move a file from the JUNK directory to the SYS 
     directory)
      mv JUNK/hw1.txt JUNK/SYS/hw1.txt
   - Example2 (to move a file from the JUNK directory to the SYS 
     directory and to use a different filename)
      mv JUNK/hw1.txt JUNK/SYS/hwa.txt
   - Example3 (to move a file to another file, if you are in the 
     directory already)
      mv hw1.txt hwa.txt
   - Example4 (to move a file to another file - rename it)
      mv JUNK/hw1.txt JUNK/hwa.txt

rm - Removes a file from the disk.
   - rm [option] path/file
   - Example1 (to remove the file hw.txt from the JUNK directory)
      rm JUNK/hw.txt
   - Example 2 (to remove a directory, all sub-directories, and 
     all files - rm recurse directories and force removal of all files)
      rm -rf JUNK

      * WARNING: rm -rf is a very dangerous command. You can 
      "wipe" out your entire "disk" if you're not carefull. Never, ever
      use rm -rf when logged in as "root". Been there, done that,
      regretted it :(

cat - Displays the contents of a file on the screen.
    - cat path/filename
    - Example1 (to list the file hw.txt in the current directory):
       cat hw.txt
    - Example2 (to list the file hw.txt in the JUNK directory):
       cat JUNK/hw.txt

WILDCARDS
	* - Word wildcard.
	? - Character wildcard.

* Note: In all of the above cases, wildcards can be used in place (or in
        conjunction with) filenames. 



more - Displays the contents of a file on the screen (only does it 
       page-by-page - you press ANY-KEY to get the next page). More can 
       also be used with cat to do a page-by-page display. For examples
       see redirect, and pipe below.

REDIRECT - REDIRECTING ("<" or ">") is a handy little tool for capturing the 
           screen into a file. 
         - Example1 (to capture the results of a ls command into a file
           called dir.txt): 
            ls > ls.txt
         - Example2 (to capture the results of a FORTRAN program (hw1) 
           into a file called output.dat):
            HW1 > output.dat 
         - Example3 (to get a page-by-page display of a data file called 
           hw5.dat):
            more < hw5.dat

PIPE - PIPING ("|") is another handy little tool for re-routing the 
       output from 1 UNIX command (or some program) directly into another
       UNIX command (or some other program).
     - Example1 (to PIPE the results from a ls command into more):
        ls | more

** The above is only a short list of UNIX commands. Consult the UNIX
manual (man) pages for more info on the UNIX commands (i.e. man cat - to
get more info on the cat command). Or consult a UNIX book.