In this tutorial we have covered all about Substitution in Unix Shell Scripting where we have seen what is Substitution, how to use substitution in shell script, different escape sequences and 2 major types of shell substitution such as- Command Substitution Variable Substitution Variable Substitution example script- ---------------------------------------------------------------------------------------------------------- #!/bin/sh echo ${var:-"Variable is not set"} echo "1 - Value of var is ${var}" echo ${var:="Variable is not set"} echo "2 - Value of var is ${var}" unset var echo ${var:+"This is default value"} echo "3 - Value of var is $var" var="Prefix" echo ${var:+"This is default value"} echo "4 - Value of var is $var" echo ${var:?"Print this message"} echo "5 - Value of var is ${var}" ------------------------------------------------------------------------------------------------------ With their syntax and some simple examples for your better understanding. In the last lecture, we have seen Loop Control in Unix Shell Scripting. we have learn following two statements that are used to control shell loops− The break statement The continue statement Also we have covered The infinite Loop with their syntax and some simple examples for your better understanding. Please find the step by step procedure to install Cygwin- 1. Download the file setup.exe from site www.cygwin.com. 2. Run the application from your local hard drive. 3. Choose the next button on first screen. 4. Select "Install from Internet" option and click next button. 5. Give a preferred installation directory and click next button. 6. Give a temporary installation directory and click next button. 7. Select "Direct Connection" and click next button. 8. Give a temporary directory and click next button. 9. Select "Direct Connection" and click next. 10. Select a download site and click next. 11. Select the packages you want to install and click next. 12. Simply select another server and continue the installation process. 13. Once installation is completed, click Finish and continue with the Setup section. If you find any difficulties, please let me know in the comments below. But first, you should be aware of Structured Query Language (SQL) which we have already covered. Please find the link for FULL COURSE OF SQL. SQL Full Course Playlist-    • SQL Full Course   PYTHON Full Course Playlist-    • Python Full Course   Data Warehouse Playlist-    • Data Warehouse Full Course   Don't forget to like and follow us on our social media accounts which are linked below. Facebook- https://www.facebook.com/ampcode Instagram- https://www.instagram.com/ampcode_tutorials/ Twitter- https://twitter.com/ampcodetutorial Tumblr- ampcode.tumblr.com Channel Description- AmpCode provides you e-learning platform with a mission of making education accessible to every student. AmpCode will provide you tutorials, full courses of some of the best technologies in the world today.By subscribing to this channel, you will never miss out on high quality videos on trending topics in the areas of Big Data & Hadoop, DevOps, Machine Learning, Artificial Intelligence, Angular, Data Science, Apache Spark, Python, Selenium, Tableau, AWS , Digital Marketing and many more. #ampcode #unix #linux #shell_scripting #shell_commands #unix_substitution