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Brief introduction

Expect is a tool based on the TCL language, which is designed to solve the problem of non-interchangeability in shell scripts. Only the output of processes started by the spawn command can be captured.

Basic command

Send: sends a string to the process to simulate the user's input

Expect: determines whether the result of the last output contains the specified string. If it is returned immediately, it will be returned after waiting for the timeout.

Spawn: start the process and track subsequent interactions

Interact: maintain the interactive state after the execution is completed, and hand over the control to the console

EOF: end interaction statu

Timeout: specifies the timeout. The default is 10s timeout-1, which never times out.

Exp_continue allows expect to continue to execute commands downwards

Send_user echo command, which is equivalent to echo

Array of $argv parameters: the expect script can accept parameters passed from bash, which can be obtained using [lindex $argv n], where n starts at 0 and represents the first parameter.

Expect execution mode

Direct execution

Embedded execution

Directly execute the script declaration: #! / usr/bin/expect

Embedded execution script declaration: #! / bin/bash

Script instance

1 log in to other hosts remotely

Direct execution

Embedded execution

2 create a user and set a password

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