How to create a file using shell script (heredoc)?

The TLDR answer:

If you need to use a shell script which would create a file with the dynamic content using few variables then you can use the code below. The approach we shall take here will use heredoc / here document syntax.

cat << EOF > demo.txt
cd "$HOME"
echo "$PWD" # echo the current path
echo "this is plain text"
EOF

file-creation.sh

Would create a file which will create a new file named demo.txt

cd "/home/thetldr-tech"
echo "/home/thetldr-tech/demo"
echo "this is plain text"

demo.txt

Where can we use this?

Use it when you want to automate to create some file in the server.
Use it in CloudFormation to create new files using EC2 launch templates.
Use it to create files which can be used in AWS code deploy hooks.

Where can we use this?

Read next