Package: redhat-lsb-core

"redhat-lsb-core" package binaries on CentOS:

/bin/redhat_lsb_init /usr/bin/lsb_release /usr/sbin/redhat_lsb_trigger.i686 /usr/sbin/redhat_lsb_trigger.x86_64

You may install this package on CentOS with yum install redhat-lsb-core