forgot my root password

Bootin single user mode and issuing the command passwd you can change root password. Next time mention os version.

This is a good root password recovery mini HOWTO.

http://www.zotteljedi.de/guides/recover-passwd-mini-HOWTO.html

A good tool is to obtain a copy of tom's root boot disk. That can be found here:
http://www.toms.net/rb/

Hope this helps.Best Regards,
Jonathan

Thats one of the security hole that you might face, after you recover your root password, keep in mind to write it to somewhere safe.

Also put password to GRUB or Lilo bootloader to prevent unauthorized root password recovery.

I have Sco Unix O/s I have forgotten my root password how can i recover my root password ?

Agree w/ Subhas. U got to be at console to do this
1. Reboot your linux machine,
2. during startup, access the setup. Choose bootup as single user.
3. change pwd.
4. reboot as normal.
Should do the trick.