shell - Comparing numbers in Bash -

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I am starting to learn how to write scripts for the bass terminal, but I can not compare how to compare To work properly I believe that this is very basic for many of you, I can not find the answer to my question anywhere (or at least I do not fully know what to find I'm using the script): 

  echo" enter two numbers "; Read a b; Echo "a = $ a"; Echo "b = $ b"; If [$ a \ & gt; $ B]; Then echo is "bigger than A B"; The second echo "B is more than one"; Fi;

The problem I have is that it compares the number to the first digit, 9 is greater than 10000, but larger than 19. How can I convert numbers into one type? To compare the truth? I know that this is probably a bit nervous, but any help would be appreciated!

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In the Bash, you should check in: 

  if ((A and G; b) ); So do not support  (())  for the POSIX shells  -lt  and  -gt . 
 
  if ["$ a" -gt "$ b"]; Then ...  
 
 You can get a complete list of comparisons operator with the  support exam .

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