Expect concept of Linux cloud computing operation and maintenance learning

expect is based on Tcl's relatively simple one freeof theThe Scripting tool language, a software suite for automating interactive functions. Like SSH .,ftp And so on, these programs normally need to be manually andits interaction, and the use of expect can simulate the process of human interaction, automatic program interaction, to achieve the purpose of automation.

< Span style= "font-family: Song" > Although such interactivity can be achieved using C, Perl, and so on, but expect more professional excellent, Simple, except Span style= "font-family: Song body; font-size:12px" > supports the Unix/linux platform, it also supports the Windows platform, can say,

Expect's workflow can be understood as : Spawn starts the process----->expect expects the keyword----->send sends characters to the process-----> exits the end.

installation Expect software : First, configure the Yum installation source, and ensure that the machine can surf the Internet, and then execute the Yum install expect-y to install the expect software, after installation to see the results .

There are many useful variables in expect, which are used in the same way as the variables in the TCL language, such as:

Set Variable name variable value #设置变量的方法

Puts $ variable name #读取变量的方法

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Expect concept of Linux cloud computing operation and maintenance learning