What should be command I use to login via script. Save my name, email, and website in this browser for the next time I comment. Notify me of followup comments via e-mail. All rights reserved Terms of Service. Expect scripting language is used to feed input automatically to an interactive program. Following three expect commands are used when automating any interactive processes. Timeout On Expect String By default, the expect timeout is 10 seconds. Automate User Processes With Expect With the help of expect, you can automate the user processes and get the expected output.
Juan October 12, , am. Greg Giese October 12, , am. Thanks tho! Keep up the good work. Scott Rowley October 12, , am.
Brian Kastor October 14, , am. Scott Rowley October 14, , pm. Pankaj December 21, , am. The match. The output is: spawn. Prakash April 25, , am. Thierry August 12, , am. Thirumal Venkat August 23, , am. For script! Biju May 11, , pm.
Please help me to handle Warning Message Password: Warning: your password will expire in 4 days my script automatically comes out after warning message encounters. Ajit June 23, , pm. Rajani August 2, , am. Its simple and very good! S Ravikumar October 5, , am. Thanks, Ravikumar Saikam. Sunil October 7, , pm. Anonymous December 10, , am. Although the script above is very simple to write, perhaps the Expect script is a little inconvenient for some people, you have it well. The autoexpect command works like the expect command, the deference is that the autoexpect will build the automation script for you.
The script you want to automate will be passed to autoexpect as a parameter and when you answer the questions and your answers will be saved in a file. After we run the above command, a single file will be generated called script. There are many commands that produce a variable output, such as FTP programs, the expected script may fail or get stuck.
To resolve this problem, you can use wildcards for the variable data to make your script more flexible. In the next example, we will show you how to set the variables and how to use them with Expect script. To define the arguments of the command line in the Expect scripts, we are going to use the following syntax:. Now we will change our script to return different conditions, and after that, we will change the expect script to deal with these conditions.
A random number is generated every time you start the script and based on that number, we have set to return different expectations. If the script hits the food output, the expect script will send pizza and if the script hits drink output the expect script will send lemonade. In expect language when we are using while loops we need to use braces like in the following example:.
Sometimes the expect script contains some sensitive information that you do not want to share with other users who use your expect scripts, such as passwords or other data, so you want your script to take this password from you and continue automation normally. The interact command will return the control back to the keyboard. When this command is executed, the expect command will begin to read from the keyboard.
After you enter your password type if you want the control to return back from the keyboard to the script. The expect language is ported into many languages like C , Java, Perl, Python, Ruby, and Shell with almost the same concepts and syntax. Expect scripting language is used in QA, network measurements, such as echo response time, automating file transfer, upgrades, updates, and many other uses.
We hope that we help you to understand some of the most important aspects of Expect command, autoexpect command and how to use them. If you use one of our fully managed cloud hosting solutions , you can always ask our technical support to install and configure any application supported in Linux. If you liked this post on How to automate shell scripts with expect command, please share it with you friends on social media on the buttons below, or if you have any question regarding this blog post, please leave a comment and one of our system administrators will reply to it.
Comments: 1. November 2, at pm. For example, in your scenario the prompt never appears, but I want the prompt. Click here to cancel reply. Spread the love. All this script does is ask for the paths to the two directories. It prints the target directory to the terminal window so that we can see that it received a response from expect and that it could read it correctly.
This shows the main three commands in expect scripts, the spawn , expect , and send commands. The first thing to notice is the shebang is referring to expect , not to bash.
The -f file flag tells expect the responses are coming from a file. This what the expect program will watch out for. The expect eof lines tells expect to wait for the final end-of-file at the completion of processing in the automated script. This is just a simple example, of course. Misspellings and incorrect wording will cause a prompt to be skipped, and the automated process will stall.
Upgrades to scripts or programs might change, remove, or introduce prompts. Keeping track of the changes and replicating them in your expect script becomes tiresome and error-prone. The most convenient way to create an expect script is to use autoexpect. This is installed along with expect. We can tell autoexpect to monitor our real-life interaction with a script or program, and to generate an expect file for us.
For example, if you mistype something in your session when autoexpect is monitoring you, the incorrect keystrokes and your editing and backspacing to correct them will all be captured. To tidy that up, simply delete that section and type the correct text. Using autoexpect is easy. We use the -f filename flag to tell it the name of the expect file it should create, and the program or script that we want it to run.
The prompts from the process and our responses are recorded and sent to the expect file. As a nice touch, autoexpect makes the expect file executable for us.
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