The /etc/shadow file is a secure file where Ubuntu stores the actual user account password, along with some other information about the account. Just like the /etc/passwd file, the /etc/shadow file contains a separate line for each user account.
A sample line from the /etc/shadow file looks like this:
The shadow password file contains eight data fields, each separated by a colon:
♦ The encrypted password
♦ The number of days since the password was last changed
♦ The number of days before the password may be changed
♦ The number of days after which the password must be changed
♦ The number of days to warn the user of an upcoming password change
♦ The number of days since January 1, 1970, that the account has been disabled
♦ Reserved data field that's not used
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