Linux/centos shell script non-interactive password change

Today when writing a shell script to find the need to set the user's password, and the setting of the password is interactive, so in the script is obviously not very good, so the Internet to find information, found the following two non-interactive set of password methods:

1. Using CHPASSWD

CHPASSWD is actually through the user input ' user name: password ' To change a set of user's password, or a batch password can be modified tool, the specific usage see CHPASSWD usage, here only to do a simple introduction

Format: # echo User name: password | chpasswd

For example, to add a Doiido account, the password is 123456, the instructions are as follows

# echo doiido:123456 | chpasswd

2. Using passwd and--stdin combination

passwd default is to use the terminal as the standard input, and--stdin means that you can use any file to do standard input, these two mates can directly modify the password

Format: # echo ' Password ' | passwd--stdin User Name

Or add a Doiido account, the password is 123456, the instructions are as follows

# echo ' 123456 ' | passwd--stdin Doiido

This allows you to modify the password in non-interactive mode, but it is not supported for some embedded Linux, and can be implemented using export.

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Linux/centos shell script non-interactive password change