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This article mainly shows you "how to use expect in linux", the content is easy to understand, clear, hope to help you solve doubts, the following let the editor lead you to study and learn "how to use expect in linux" this article.

In linux, expect is an automated interaction suite, which is mainly used in the execution of commands and programs, the system requires the input of a specified string in the form of interaction, to achieve interactive communication, the execution syntax is "yum install-y expect"; the script can be executed only if expect is installed.

The operating environment of this tutorial: linux7.3 system, Dell G3 computer.

Expect is an automatic interaction suite, which is mainly used in the execution of commands and programs, the system is required to input a specified string in the form of interaction to achieve interactive communication.

Expect automatic interaction process:

Spawn starts the specified process-expect gets the specified keyword-send sends the specified character to the specified program-executes the completion exit.

Note that the script can be executed only if expect is installed

Yum install-y expect

Summary of common expect commands:

The spawn interactive program starts with a command or a specified program

If the matching information is obtained by expect, the program action behind expect will be executed if the match is successful.

Send exp_send is used to send specified string information

Exp_continue needs to be used for multiple matches in expect.

Send_user is used to print out the equivalent of echo in shell.

Exit exits the expect script

Eof expect execution ends and exits

Set defines variables

Puts output variable

Set timeout sets the timeout

Example:

1.ssh logs in to the remote host to execute the command, executing the method expect 1.sh or. / 1.sh

# vim 1.sh #! / usr/bin/expectspawn ssh saneri@192.168.56.103 df-Thexpect "* password" send "123456\ n" expect eof

2. Ssh remote login host to execute commands, execute expect commands in shell scripts, execution methods sh 2.sh, bash 2.sh or. / 2.sh can be executed.

#! / bin/bashpasswd='123456'/usr/bin/expect

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