https://www.chegg.com/auth?type=simplifiedstudy&action=signup&data=sCS_P_control&redirect=%2Fcheckoutinterstitial%2Fhwh%...
(same link : this is the link )
https://www.chegg.com/homework-help/questions-and-answers/objective-write-bash-scripts-review-section-6-week-10-11-black...
