Examples of interactive behaviors such as automatic password input by background programs in Linux

Develop a scheduled task today and add it to the cron list. However, there is a problem. You need to enter the Database Password during script execution:

Mysql-u root-p <SQLuse db; set names utf8; 'cat task. SQL 'SQL

After running the above Code, a message is displayed:

Enter password:

After searching, we found that CT can help us complete this task:

Save the above Code to a file: db. sh and write the following code:

#! /Usr/bin/login CT-fspawn db. shexpect "Enter password:" send -- "password \ n" interact

Then, we will enter the database interaction interface.

The first line indicates the program to run the script;

The second line focuses on starting a program we want to execute under Objective CT;

The third line is also the focus. We need to tell secondary CT to help us complete interaction when information appears;

The fourth line is the content to be sent when the password is prompted;

The fifth line means to maintain interaction and do not exit. If this statement is not provided, the script will exit immediately after successfully logging on to the database.