Best answer: How use Linux expect?

How Expect works in Linux?

expect command or scripting language works with scripts that expect user inputs. It automates the task by providing inputs. First we write a script that will be needing inputs from users and then we will write another script using expect to automate the task.

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).

How do you install expect 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.

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.

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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.

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.

What type of terminal does CLI expect?

Expect is used to automate control of interactive applications such as Telnet, FTP, passwd, fsck, rlogin, tip, SSH, and others. 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.

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.
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19 дек. 2013 г.

What is spawn in Linux?

Spawn in computing refers to a function that loads and executes a new child process. The current process may wait for the child to terminate or may continue to execute concurrent computing. Creating a new subprocess requires enough memory in which both the child process and the current program can execute.

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.

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.

How do I install Windows expect?

Steps to start Expect on Windows:

  1. Download and install Tcl.
  2. Go to Bin directory in Command prompt (Start > Run > Command > cd c:Tclbin)
  3. Issue the command C:Tclbin>teacup install Expect.
  4. Done!!

How do you use expect in a sentence?

Expect sentence example

  1. I didn’t expect you so soon. …
  2. I expect nothing less from you. …
  3. She didn’t expect Death to listen. …
  4. I don’t expect you to start now. …
  5. She didn’t expect it to bother her as much as it did. …
  6. Just didn’t expect to see … …
  7. Don’t expect anything from Jule.
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What is Sshpass?

sshpass is a simple and lightweight command line tool that enables us to provide password (non-interactive password authentication) to the command prompt itself, so that automated shell scripts can be executed to take backups via cron scheduler.

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