Package: diffutils

"diffutils" package binaries on CentOS:

/usr/bin/cmp /usr/bin/diff3 /usr/bin/diff /usr/bin/sdiff

You may install this package on CentOS with yum install diffutils

"diffutils" package binaries on Debian:

/usr/bin/cmp /usr/bin/diff3 /usr/bin/diff /usr/bin/sdiff

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