Multiple choice unix

Which of the following special shell variables is used to process number of the last background job?





    

      
    
            
  1. 
              $!
            
    2. 
            
  2. 
              $#
            
    3. 
            
  3. 
              $0
            
    4. 
            
  4. 
              $*
            
    5. 
      

    


    

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        A
        Correct answer
      

        

          Explanation
          

            
$! contains the process ID (PID) of the last background job. $# counts positional parameters, \$0 is the script name, $* references all parameters as a single string.


          

        

    

  



          

      
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