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Cross-platform utilities for prompting the user for credentials or a
passphrase, for example to authenticate with a server or read a
protected key. Includes native programs for MacOS and Windows, hence
no 'tcltk' is required. Password entry can be invoked in two different
ways: directly from R via the askpass() function, or indirectly as
password-entry back-end for 'ssh-agent' or 'git-credential' via the
SSH_ASKPASS and GIT_ASKPASS environment variables. Thereby the user
can be prompted for credentials or a passphrase if needed when R calls
out to git or ssh.
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