I am tryting to make initrd file system following [this tutorial][1] My host system is RHEL 6 64 bit. I am unable to get the required command: genext2fs No rpm is available for it, neither yum  is helping me. I hope there is an alternate to this command. 
Is there any alternative to genext2fs in RHEL?
linux;kernel;rhel;compiling;ext2
If you want genext2fs, it's easy to find; build it from source. But you probably don't want it. Create an initramfs instead. That's the normal method these days.