/usr/bin/sge_coshepherd
/usr/bin/sge_execd
/usr/bin/sge_shepherd
/usr/share/gridengine/bin/lx26-amd64/sge_coshepherd
/usr/share/gridengine/bin/lx26-amd64/sge_execd
/usr/share/gridengine/bin/lx26-amd64/sge_shepherd
You may install this package on CentOS with
yum
install gridengine-execd