With password-based authentication so prevalent online these days, you may need or already use some sort of password management tool. There are various online or offline services or software tools for that matter, and they vary in terms of their sophistication, user interface or target environments (e.g., enterprises or end users). For end users, there are a few GUI-based password managers, for instance, KeePass(X). If you do not want any kind of GUI dependency for password management, I would highly recommend pass, a simple command-line utility for password management.
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