/bin/bash --norc

/bin/bash --norc /sbin/mkinitrd -f --with=vmxnet --with=vmxnet3 --with=pvscsi /boot/initrd-2.6.18-238.12.1.el5.img 2.6.18-238.12.1.el5

what is that mean?

man bash
       --norc Do not read and execute the personal initialization file ~/.bashrc  if  the  shell  is  interactive. This option is on by default if the shell is invoked as sh.