Wheel user password “reset itself”, now twice
To fix it there is usually a backup /etc/passwd~. Verify your username is at the end of the file and - if it is - use cp to replace the existing file.
sudo cp /etc/passwd~ /etc/passwd
No - passwords are never reset by an update.
Confused by the presence of a file named passwd.pacnew?
It would happen if you - without giving thought to the process - replace a configuration with a .pacnew file
Never automate .pacnew files - it may wreck your system completely.
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