regex Part 1 - Data Manipulation
LPI E - Data Manipulation 3.2 Searching and Extracting Data from Files Part 1 of 2 Part 2: Regular Expressions (regex) In this blog post, we will explore some of the most common commands that are used to search and extract data from files in Linux. Specifically, we will be discussing grep less cat head tail sort cut wc The blog will finish by showing how to use the data manipulation tools for I/O Redirection and giving several examples for Regular Expressions (regex) to use when analyzing text within the Linux Terminal. grep Command The grep command is used to search for patterns in a file or set of files. The syntax for using grep is as follows: $ grep pattern filename For example, if we want to search for the word "apple" in a file called "fruits.txt", we can use the following command: $ grep apple fruits.txt This will display all the lines in the file that contain the word "apple". The grep command is also capable of using regular expressions to s...