How Linux root retrieves the password

How Linux root retrieves the password

First, retrieve the root password: 1.    boot up  Booting Red Hat Enterprise Linux Client  (... )  in 3 seconds ...  Press any key to enter the menu, 2.    Select the current boot entry, such as  Red Hat Enterprise Linux Client  (2.6.18-194.E15)   Press   "E" into the editing interface, (password protection can be set: refer to "linux root  Password Grup protection") 3.    the editing interface has three lines of options, select the  kernel  start option, press   "E" to enter the editing interface; 4.    the last side of the command line added   " single" (note the space before the single), enter return to the editing interface; 5.    continue to select the  kernel  start option, press "B" to start the single user mode; 6.    after entering the system, change password   "passwd root"  –->  enter root  password, restart, password modification is complete. Second, the precautionary method: 1. vi /etc/grub.conf2.  added    password --md5 $1$pp5eg$ under  timeout=5  s8ytueridzzl2kvjvmv.       Save to exit.   The function is to use grub  to change the password when password authentication is required to change the password.     Note: Where  $1$a26yf$VDyOb3O3IEWo3s9wRZjqF1  generation method: #grub-md5-crypt  Enter the password after the return, return, re-enter the password, Enter, generate the MD5 code of the password

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How Linux root retrieves the password