Linux forgot Root Password

About lilo
1. When lilo appears: Enter linux single
Lilo: linux single
2. Press enter to directly access the Linux Command Line
3. Use the PASSWORD command to change the password

Ii. About grub
1. When the grub screen appears, use the up/down key to select the item that you usually start Linux, and then press the e key.
2. Use the up and down keys again to select the one you usually start Linux (similar to kernel/boot/vmlinuz-2.4.18-14 Ro root = label =/), and then press the e key
3. Modify the command line you see and add single. The result is as follows:
Kernel/boot/vmlinuz-2.4.18-14 single Ro root = label =/single
4. Press enter to return, and then press the B key to start, you can directly enter the Linux Command Line
5. Run the PASSWORD command to change the password.

If the system configuration and script file are incorrect, the root file system in linux single-user mode is read-only file system:

Sh-3.00 # Mount-O remount RW-T ext3/

By re-mounting the root file system to read/write, you can edit the system files with errors.