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• Recursive touch
  Touch a bunch of directories recursively. All the directories and their contents (To re-stamp time on all files)
  
              $ find DIR | xargs touch
  
  
• Redirecting Standard Error
  Redirecting errors when compiling,the number 2 represents the standard error output stream,
  1 represent standard output.
  
              $ make  > output.txt 2>&1
  
  
• Command Substitution
  To use command substitution, enclose any command that generates output to standard output
  inside parentheses and precede the opening parenthesis with a dollar sign, $(command).
  It is handy for using the output of one command as an argument to another command.
  
              $ rpm -ql $(rpm -qa | grep httpd)
  
  
• Using for Loops from the Command Line
  For small loops it can be a great time saver. Example: A simple loop to make a
  backup copy of all the files in a directory:
  
            $ for file in * ; do cp $file $file.bak; done

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