Printing lines in the reverse order

- [Male Narrator] Hi and welcome to the next video…of section four,…printing lines in the reverse order.…In the previous video,…we learned about printing text…between line number and pattern numbers.…In this video, we'll see how to print lines…in the reverse order.…This is a very simple section.…It may not seem very useful,…but it can be used to emulate the stacked data…of structure in bash.…This is something interesting.…Let's print the lines of a text file in reverse order.…A little hack with awk can do the task.…However, there is a direct command, TAC,…to do the same as well.…

TAC is the reverse of CAT.…We will first see how to do this with TAC.…The TAC syntax is as follows.…It can also read from standard in as follows.…In TAC, slash n is the line separator,…but we can also specify our own separator…by using the minus s separator option.…We can do it in awk as follows.…Slash in the shell script…is used to conveniently break a single line command sequence…into multiple lines.…

The awk script is very simple.…We store each of the lines into an associative array…