TLDR
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unshadow

 
Utility provided by the John the Ripper project to obtain the traditional Unix password file if the system uses shadow passwords. More information: https://www.openwall.com/john/.
 
  • Combine the /etc/shadow and /etc/passwd of the current system:
     
    sudo unshadow /etc/passwd /etc/shadow
     
  • Combine two arbitrary shadow and password files:
     
    sudo unshadow {{path/to/passwd}} {{path/to/shadow}}

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