libpasswd-unix-perl 0.62-1 (amd64 binary) in ubuntu precise

 The Passwd::Unix module provides an abstract interface to /etc/passwd,
 /etc/shadow and /etc/group format files. It is inspired by Unix::PasswdFile
 module (that one does not handle /etc/shadow file, what is necessary in
 modern systems like Sun Solaris 10 or Linux).