why we use env file?
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env file is a convenient way to store environment-specific variables, such as API keys and database passwords, in a simple text file. This enables you to manage sensitive information consistently while maintaining its security.
The . env file contains the individual user environment variables that override the variables set in the /etc/environment file. You can customize your environment variables as desired by modifying your . env file.
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The other grepper is wrong. Do not put quotation marks. From Docker:
"There is no special handling of quotation marks. This means that they are part of the VAL."