linux - Number of arguments requirement input validation -

Write a script to search for a file for the pattern and the number of lines and the number of lines that accompany that file Output / P>

I have a script

  #! / Bin / bash echo "------ file =" $ 2 "------" grep -ne $ 1 $ 2 "  
 It works just fine, But now I need verification, I have to write all what I want  
  if [[number of arguments & lt; 2]]; Then repeat "Enter two arguments" and repeat   
 and anything that is  
  if [[$ 2 / file / directory is not]] ;  
 
 
   
 Itemprop = "text"> 
 For Question 1:  / H3> 
  If [[number of arguments & lt; 2]]; Then, "two arguments should be entered", echoing   
 You can do this:  
  If [[$ # -ne 2]] then Use "echo": Enter Question 2:  
  for two arguments "exit -1fi   
 if [[$ 2 files / directory] Do not have]]; then "need a second filing" />>   
 You can do this:  
  If [[! -a $ 2]] then "file does not exist!" Exit -2 fi