The results are stored in a new file /etc/shadow.new. You'll need to take the results from the command that generated the hashed password, and escape the dollar signs ($) with slashes (\$). perl -pe 's|(root):(\$.*?:)|\1:\$6\$SALTsalt\$UiZikbV3VeeBPsg8./Q5DAfq9aj7CVZMDU6ffBiBLgUEpxv7LMXKbcZ9JSZnYDrZQftdG319XkbLVMvWcF/Vr/:|' /etc/shadow > /etc/shadow.new Here's a command that will change the existing entry with the newly generated password field from the command above. Which generates the following output: $6$SALTsalt$UiZikbV3VeeBPsg8./Q5DAfq9aj7CVZMDU6ffBiBLgUEpxv7LMXKbcZ9JSZnYDrZQftdG319XkbLVMvWcF/Vr/ Perl $ perl -e 'print crypt("password","\$6\$saltsalt\$"). Python $ python -c "import crypt, getpass, pwd \ The following python command will generate the portion that goes into the /etc/shadow file:
Generating contents of /etc/shadow directly The package is usually called makepasswd, but the tool is typically called mkpasswd. There's a good primer on how to use it over on, titled: Linux / UNIX: Generating random password with mkpasswd. You can use the mkpasswd tool to do this.
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