Here is an easy way to find this, in command line type
$ getconf LONG_BIT
Synopsis:
getconf [-v specification] system_var
the getconf utility shall write to the standard output the value of the variable specified by the system_var operand.
So it prints the value of ‘LONG_BIT’.
Read linux manual for getconf: http://linux.die.net/man/1/getconf
Author: Abhilash
Hi, I’m Abhilash! A seasoned web developer with 15 years of experience specializing in Ruby and Ruby on Rails. Since 2010, I’ve built scalable, robust web applications and worked with frameworks like Angular, Sinatra, Laravel, Node.js, Vue and React.
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The Rails Drop 
Nice one!!!
thank you…