I did a gram of cocaine last night n I have a hair rest in 60 days will it show up. That is all I've don in the last 9 months

In all likelihood it will. Of all the drugs cocaine is the most readily detected in hair.

If it's a hair folical test your boned, if it's a urinallisis you should be fine.

I have heard of people in a similar situation
Shaving their entire body for 30 days.

Then letting it grow out for the next thirty...

I wouldn't recommend doing it, I'd rather stay away from
The damn cocaine , it's easier.