how to install pip3 -r requirements.txt in a bash file

[MJ-One]

sudo pip3 install virtualenv
cd /home/ec2-user/app
virtualenv environment
source environment/bin/activate
sudo pip3 freeze > requirements.txt
sudo pip3 install -r requirements.txt

this is the code i have written in a bash file and i get the error like no file names requirements.txt found. What should i do?