If the super user will forget the password, it will not be able to enter the system and cannot manage and use the system. This kind of thing is unlikely, but in some Linux stand-alone users, especially in beginners, it is relatively easy. The general solution is to format the hard disk to reinstall the system, but this is a bit small matter. Prepare bootdisk and rootdisk two floppy disks, start from the floppy drive, start to the root disk and the shell prompt appears. To the / mnt directory of the Linux root directory, such as your Linux on the hard disk first partition, enter mount / dev / hda1 / mnt in the command line, then enter the mnT directory, change the ETC / Passwd file, enter MV / MNT / etc / passwd / mnt/etc/passwd.bak is OK; then use the command cp / etc / passwd / mnt / etc / passwd to copy the / etc / passwd file on the floppy disk into the ETC directory in the hard disk. This will not ask the super password when it is started by the hard disk. When logging in; finally use the mv / etc / passwd.bak passwd command to change the passwd file back, and then run the passwd command to reset the password.
