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 cd  --  change directory  
	     ls  --  list  contents of directory
	     pwd  --  print working directory  
	     cp  --  copy  a file between directories 
	     mv  --  move  a file between directories 
		or change its name
	     rm  --  remove  a file
	     rmdir  --  remove directory
	     pushd  --  push directory : change 
		working directory and store old one on directory stack
	     popd  --  pop directory  pop last 
		directory off of stack and change to it