Linux expect installation tutorial

Expect is a free programming tool language used to implement automated and interactive tasks for communication without human intervention. Using it, system administrators can create scripts to provide input to commands or programs that expect input from the terminal. Generally speaking, these inputs require manual input. Expect can simulate standard input according to the program's prompts to provide the input required by the program to implement interactive program execution. Expect is a tool based on tcl. It also provides some commands that Tcl does not have. It can be used to perform some command operations that cannot be interacted with under Linux, and plays a great role in remote management.

Because expect is based on tcl, you need to have tcl installed in your system.

How to check?

[root@dev ~]# whereis tcl    
tcl: /usr/lib/tcl8.4 /usr/share/tcl8.4

If you cannot see the result, please install tcl first

> Install tcl

Download the tcl installation package, and then unzip the tcl installation package (can be used directly under centos system yum install tcl; Under the ubuntu system, you can directly use the apt-get install tcl command for quick installation)

Homepage: http://www.tcl.tk
Download address: http://www.tcl .tk/software/tcltk/downloadnow84.tml

1. Download the source package

[root@dev ~]# wget http://nchc.dl.sourceforge.net/sourceforge/tcl /tcl8.4.11-src.tar.gz

2. Unzip the source package

[root@dev ~]# tar xfvz tcl8.4.11-src.tar.gz

3. Installation and configuration

 [root@dev ~]# cd tcl8.4.11/unix    
 [root@dev ~]# ./configure --prefix=/usr/tcl --enable-shared    
 [root@dev ~]# make    
[root@dev ~]# make install

After the installation is completed, enter the root directory of the tcl source code and copy tclUnixPort.h under the subdirectory unix to the subdirectory generic.

Don't delete the tcl source code yet, because it is still needed for the expect installation process.

> Install expect

Homepage: http://expect.nist.gov/

Download the source code package

[root@dev ~]# wget http://sourceforge.net/projects/expect/files/Expect/5.45/expect5.45.tar.gz/download

2. Unzip the source code package

[root@dev ~]# tar xzvf expect5.45.tar.gz

3. Installation configuration

 [root@dev ~]# cd expect5.45    
[root@dev ~]# ./configure --prefix=/usr/expect --with-tcl=/usr/local/tcl/lib --with-tclinclude=/opt/tcl8.4.11/generic/ --enable-shared    
[root@dev ~]# make    
 [root@dev ~]# make install

Note: The specified /opt/tcl8.4.11/generic/ creates a connection symbol for the tcl directory we decompressed above

>

##[root@dev ~]# ln -s /usr/local/expect/bin/expect /usr/bin/expect

> Check the connection symbol

 [root@dev ~]# ls -l /usr/bin/expect    
lrwxrwxrwx. 1 root root 28 9月   8 11:21 /usr/bin/expect -> /usr/local/expect/bin/expect

this Symbolic links will be used when writing expect script files. For example, the header of the expect file will specify the shell used to execute the script

#!/usr/bin/expect

> test

[root@dev ~]# expect    
expect1.1> exit    
 [root@dev ~]#

This way you can start running the expect script.

The above is the entire content of the Linux expect installation tutorial. I hope it will be helpful to everyone.

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