/etc/shadow : how to generate $6$ 's encrypted password?

On Debian-based systems you can use mkpasswd.

mkpasswd -m sha-512 PASSWORD [SALT]

(PASSWORD is your desired password; SALT is optional.)

Strangely, that tool is found in the whois package.

sudo apt-get install whois

Python:

python -c 'import crypt; print crypt.crypt("password", "$6$saltsalt$")'

(for python 3 and greater it will be print(crypt.crypt(..., ...)))

Perl:

perl -e 'print crypt("password","\$6\$saltsalt\$") . "\n"'

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