Linux Interactive and non-interactive Two examples of modifying user password methods

Recently managed a number of machines, there is a need to unify the change of an account username password, such as the QA account password changed to 1234, and later for scripting, very convenient implementation, but also used to modify the user's password non-interactive. Simply record it.

1. Interactively configure the local user's password: passwd command

The code is as follows	Copy Code
[Root@host_221-81 ~]# passwd QA Changing password for user QA. New Password: Bad password:it are too short Bad Password:is too simple Retype new Password: Passwd:all authentication tokens updated successfully.

2. Non-interactive change password for local User: CHPASSWD

The code is as follows	Copy Code
# CHPASSWD commands are simple to use [Root@host_221-81 ~]# echo "qa:1234" | chpasswd # using the passwd command, you can also implement a non-interactive password change [Root@host_221-81 ~]# echo "1234" | passwd--stdin "QA" Changing password for user QA. Passwd:all authentication tokens updated successfully.

3. Use expect to process interactive input, which enables non-interactive password modifications.

code is as follows	copy code
#!/bin/sh # Exec expect-f "$" "$@" If {$ARGC!= 2} {     puts "Usage: $ARGV 0 <username> & Lt;passwd> "     exit 1 } Set password [lindex $argv 1] Spawn passwd [lindex $argv 0] Sleep 1 Expect "Assword:" Send "$passwordr" Expect "Assword:" Send "$passwordr" expect EOF

Note: The second line of the script, which may be unfamiliar, is the syntax in the TCL language, the backslash is recognized as part of a comment to sh, but in Tcl the backslash Continu Es the comment into the next line which keeps the EXEC command from executing again.

The execution result of the script is:

The code is as follows	Copy Code
[Root@smilejay ~]#./change-pwd-expect.sh QA 1234 Spawn passwd QA Changing password for user QA. New Password: Bad password:it are too short Bad Password:is too simple Retype new Password: Passwd:all authentication tokens updated successfully.