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In the second answer in this thread is a warning about changing the UNIX password for "postgres".
I have already changed the password for "postgres".
How could I restore the initially state of the user "postgres"?

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1 Answer 1

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Like the comments in this answer suggest, just edit the file /etc/shadow as root (e.g. run sudo nano /etc/shadow in a terminal) and replace the hashed password in postgres's line with *.

(If you don't have that line or that file, it'd be interesting to know which Linux distribution and nsswitch settings you use.)

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I have overlooked the comments. –  sid_com Jan 15 '13 at 17:28

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