Comp 121 - Summary of Unix Commands 

Use the text editor "pico".  More information on any Unix command 
can be obtained in Unix by typing
    man cmd
for example "man pico" gives detailed documentation on the
pico editor.  One of the first things you should do is to change
your Unix password using the Unix command "passwd".


mkdir - used to create directories (folders)

usage:
  mkdir 

example:
  mkdir comp121



pwd - used to find out the name of your current folder

usage:
  pwd

note: this command returns a 'fully qualified' directory name.  The name
that
      appears after the last / character is the name of your current
      directory.  The one to the left of that is the name of the
      directory that contains your current directory.  This is a good
      example of a tree data structure, something you will be learning
      this semester.



cd - used to change directories (folders)

usage:
  cd 

note: the special dirname ".." means the directory which contains the one
you
      are currently in.

example:
  mkdir comp121



ls - display the contents of the current directory

usage:
  ls 

note: options are optional.  A good one to use is -l, which stands for
 /long format/

example:
  ls -l



more - display the contents of a file

usage:
  more 

note: if the file is longer than a screenfull, more will pause between
screens.
      you can press the space bar to move to the next screen.

example:
  more foo


cp - copy a file

usage:
  cp  

note: cp will not destroy the original file

example:   -- will create a new file called bar that is a copy of the file
foo
  cp foo bar



mv - rename (move) a file

usage:
   mv  

note: mv is like cp, but the original will be destroyed

example:   -- will rename file foo to now be called bar, foo will go away
   mv foo bar



rm - remove a file (make it go away)

usage:
   rm 

note: this command is irreversible.  Once you rm a file, you can't
undelete it.

example:
   rm foo



man - display the manual page for a command

usage:
   man 

note: man uses the more program to display the help

example:   -- will show the manual page for the man command
   man man



g++ - the C++ complier we will be using on the Unix machines

usage:
    g++ 

note: you can put multiple filenames, if needed

example:
    g++ project1.cc




a.out - name of the "executable" program created by g++

usage:
   a.out

note:  If you don't want a.out to be lost when you re-compile, then "cp"
it to        another name before compiling again with g++

example:
   a.out