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 on Linux?
The Linux expect command takes script writing to an entirely new level. Instead of automating processes, it automates running and responding to other scripts. In other words, you can write a script that asks how you are and then create an expect script that both runs it and tells it that you’re ok.
What expect command do 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 does expect EOF do?
The final command ” expect eof ” causes the script to wait for the end-of-file in the output of passwd . Similar to timeout , eof is another keyword pattern. This final expect effectively waits for passwd to complete execution before returning control to the 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.
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 you install expect on Linux?
Detailed Instructions:
- Run update command to update package repositories and get latest package information.
- Run the install command with -y flag to quickly install the packages and dependencies. sudo apt-get install -y expect.
- Check the system logs to confirm that there are no related errors.
How do I run an expect script?
1. Execute expect script from the command line using -c option. expect also also allows you to execute it directly in the command line using -c option as shown below. Once you run the above script, it waits for the newline(n) and upon pressing the enter key, it will print the message “pressed enter” and exits.
How do you check if expect is installed in Linux?
Use pacman command to check if the given package is installed or not in Arch Linux and its derivatives.
How do I manually install an expect?
Solution:
- Download the ecpect package from the below link. http://sourceforge.net/projects/expect/
- Install the required dependecy packages “Tcl/Tk” language toolkit. # yum install tcl.
- Install the “expect” package using the below commands.
How do I expect a bash script?
How to Use Expect In Bash Script
- Step 1 : Create a new file. vi expectcmd.
- Step 2 : Copy and paste below given content in file. …
- Step 3: Make your file executable by owner of file , run the given below command. …
- Step 4: Give commands as argument along with expectcmd script.