You asked: What is expect package in Linux?

Expect is a program that “talks” to other interactive programs according to a script. Following the script, Expect knows what can be expected from a program and what the correct response should be. … It behaves just like Expect and Tk’s wish. Expect can also be used directly in C or C++ (that is, without Tcl).

What is expect command in Linux?

expect command or scripting language works with scripts that expect user inputs. It automates the task by providing inputs. // We can install expect command using following if not installed.

What is expect Tool?

Expect is a tool for automating interactive applications such as telnet, ftp, passwd, fsck, rlogin, tip, etc. … You will find that Expect is an absolutely invaluable tool – using it, you will be able to automate tasks that you’ve never even thought of before – and you’ll be able to do this automation quickly and easily.

What does expect EOF do?

We then use send to send the input value of 2 followed by enter key(indicated by r). The same method is used for the next question as well. expect eof indicates that the script ends here. You can now execute the file “” and see all the responses given automatically by expect.

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How do I install an Expect package in Linux?


  1. Download the ecpect package from the below link.
  2. Install the required dependecy packages “Tcl/Tk” language toolkit. # yum install tcl.
  3. Install the “expect” package using the below commands.

9 нояб. 2011 г.

How use Linux expect?

Then start our script using spawn command. We can use spawn to run any program we want or any other interactive script.

Expect Command.

spawn Starts a script or a program.
expect Waits for program output.
send Sends a reply to your program.
interact Allows you to interact with your program.

How do I automate a Linux command?

Here are my steps, in order:

  1. launch putty, choose hostname & port, click Open (would love to script/automate this 1st part too)
  2. linux shell/terminal opens.
  3. I enter my login and pwd.
  4. I enter this command: sudo su – psoftXXX.
  5. I enter my pwd again and hit enter.
  6. I am presented with a little cmd-shell menu and a prompt. …
  7. cd /

15 февр. 2013 г.

What is Interact in Expect?

Interact is an Expect command which gives control of the current process to the user, so that keystrokes are sent to the current process, and the stdout and stderr of the current process are returned.

What type of terminal does CLI expect?

Expect uses pseudo terminals (Unix) or emulates a console (Windows), starts the target program, and then communicates with it, just as a human would, via the terminal or console interface. Tk, another Tcl extension, can be used to provide a GUI.

How do I expect in bash?

How to Use Expect In Bash Script

  1. Step 1 : Create a new file. vi expectcmd.
  2. Step 2 : Copy and paste below given content in file. Change the value as per your information in variables – …
  3. Step 3: Make your file executable by owner of file , run the given below command. chmod 750 expectcmd.
  4. Step 4: Give commands as argument along with expectcmd script.
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What is << in Linux?

< is used to redirect input. Saying command < file. executes command with file as input. The << syntax is referred to as a here document. The string following << is a delimiter indicating the start and end of the here document.

What is EOF in bash?

The EOF operator is used in many programming languages. This operator stands for the end of the file. … Similarly, in bash, the EOF operator is used to specify the end of the file. When this operator is paired with the “cat” command in bash, it can be used to serve various other purposes.

How do you write EOF in terminal?

  1. EOF is wrapped in a macro for a reason – you never need to know the value.
  2. From the command-line, when you are running your program you can send EOF to the program with Ctrl – D (Unix) or CTRL – Z (Microsoft).
  3. To determine what the value of EOF is on your platform you can always just print it: printf (“%in”, EOF);

15 авг. 2012 г.

How do you check expect is installed or not?

To avoid this you should first check if the package is installed on the system and only then try its installation. There are some commands to quickly check whether a package is already installed or not.

2. d) On Ubuntu/Debian

  1. apt command.
  2. apt-cache command.
  3. dpkg command.
  4. dpkg-query command.

19 дек. 2013 г.

How do you use expect in Python?

There are two common methods in Pexpect — expect() and send() (or sendline() which is like send() with a linefeed). With the expect() command you cause your script to wait for the child application to return a string. The string can be regular expression. The send() method writes a string to the child application.

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How install Ubuntu expect?

Detailed Instructions:

  1. Run update command to update package repositories and get latest package information.
  2. Run the install command with -y flag to quickly install the packages and dependencies. sudo apt-get install -y expect.
  3. Check the system logs to confirm that there are no related errors.
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