Hi Vrishni Shree V B, Very well explained but I would like to highlight one thing in your script where you are comparing 2 number

if [$a -gt $b] then

Note: this code will give an error because if and then must be separated either with semicolon (;) or with new like. As I have given below

if [$a -gt -$b] then

or

if [$a -gt -$b]; then

Happy Learning.!