How do you sign a message with your monero private key using the cli-wallet, gui-wallet, and last with pure js using what libraries?

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With monero-wallet-cli, you can sign the content of a file (e.g. message_file) with the command sign message_file, and verify the signature with verify message_file address_of_the_signer signature.

With monero-wallet-gui, in the menu go to Advanced -> Sign/Verify, then you can sign (or verify) a message or a file by filling the appropriate boxes.

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