Chapter 4. Texting and Driving

In this chapter, we will cover the following recipes:

• Using regular expressions

• Searching and mining text inside a file with grep

• Cutting a file column-wise with cut

• Using sed to perform text replacement

• Using awk for advanced text processing

• Finding frequency of words used in a given file

• Compressing or decompressing JavaScript

• Merging multiple files as columns

• Printing the nth word or column in a file or line

• Printing text between line numbers or patterns

• Printing lines in the reverse order

• Parsing e-mail address and URLs from text

• Removing a sentence in a file containing a word

• Replacing a pattern with text in all files in a directory

• Text slicing and parameter operations