203050029 solve question q2
203050113 solve question q1
203050111 solve question q3
203050035 solve question q4

References-
       https://devhints.io/bashhttps://linuxconfig.org/bash-scripting-tutorial-for-beginnershttps://ubuntu-maryland.org/presentations/reference_bash-cheat.pdf
       https://devhints.io/bash
       https://linuxconfig.org/bash-scripting-tutorial-for-beginners
       https://ubuntu-maryland.org/presentations/reference_bash-cheat.pdf
