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  Linux into single user mode to modify the administrator password
  Add Date : 2018-11-21      
  Linux System version: CentOS 6.6

1, boot into the boot screen press e or the Enter key to enter the GRUB boot menu

2. Press e to enter edit mode, the arrow keys move the switch to the second row of the kernel line;

3. Press e to enter the kernel edit the command line, as shown below, with the cursor and then enter a space or single or 1 s

After the input is complete press Enter to save the return to the previous start menu, press b to start the system

4, start the system does not need to enter the administrator password to enter single-user mode, then enter the command passwd can change the administrator password;

Run level 5, the single-user mode

Enter 1 to run level display

[Root @ yong ~] # runlevel

1 S

Enter s or single run level shown as

[Root @ yong ~] # runlevel


Single-user mode is not networking; equivalent to Windows Safe Mode.
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