password

*** onyx ***
*** Retrieving a password:
plesk login
*** Resetting a password:
plesk bin admin --set-admin-password -passwd "*****"

*** 12.x ***
*** Retrieving a password:
plesk bin admin --show-password
*** Resetting a password:
plesk bin admin --set-admin-password -passwd "*****"

*** 10.x - 11.x: ***
*** Retrieving a password:
/usr/local/psa/bin/admin --show-password
*** Resetting a password:
/usr/local/psa/bin/init_conf -u -passwd "*****"

*** plesk mysql password file ***

/etc/psa/.psa.shadow