How should the password be written in my_password.txt and where this file should be located

General
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1

cat ~/my_password.txt | docker login --username foo --password-stdin

how should the password be written in my_password.txt and where this file should be located

2

Can you share your exact use case?

Since your command is a login n Docker Hub, and you used the Windows tag, I assume you use Docker Desktop for Windows, where the login information should be already shared by Docker Desktop.