Package: passwd

"passwd" package binaries on CentOS:

/usr/bin/passwd

You may install this package on CentOS with yum install passwd

"passwd" package binaries on Debian:

/sbin/shadowconfig /usr/bin/chage /usr/bin/chfn /usr/bin/chsh /usr/bin/expiry /usr/bin/gpasswd /usr/bin/passwd /usr/sbin/chgpasswd /usr/sbin/chpasswd /usr/sbin/cpgr /usr/sbin/cppw /usr/sbin/groupadd /usr/sbin/groupdel /usr/sbin/groupmod /usr/sbin/grpck /usr/sbin/grpconv /usr/sbin/grpunconv /usr/sbin/newusers /usr/sbin/pwck /usr/sbin/pwconv /usr/sbin/pwunconv /usr/sbin/useradd /usr/sbin/userdel /usr/sbin/usermod /usr/sbin/vigr /usr/sbin/vipw

You may install this package on Debian with apt-get install passwd