Two methods of changing passwords interactively in shell scripts _linux shell

Today, when writing a shell script to find that you need to set the user's password, and set the password is interactive, so in the script is obviously not very good, so the Internet to find data, found the following two common way to set the password is not interactive:

1: Use CHPASSWD

CHPASSWD is actually through user input ' username: password ' To change a group of user's password, or a can batch modify the password tool, specific usage see CHPASSWD usage, here only do simple introduction

Format: # echo User name: password | chpasswd

Instance:

Add a Doiido account with a password of 123456

Copy Code code as follows:

# echo doiido:123456 | chpasswd

2: Use passwd and--stdin combinations

passwd default is to use the terminal as a standard input, and--stdin said that can use arbitrary files to do standard input, these two can be directly modified password

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

Instance:

Add a Doiido account with a password of 123456

Copy Code code as follows:

# echo ' 123456 ' | passwd--stdin Doiido

This enables you to modify the password in non-interactive mode, but some embedded Linux is not supported in either way, and you can use export to implement it.