In earlier lessons we learned how to search for files using the Linux “find” command. We can actually search within files using the “grep” command. This video shows you how to search for words or terms within files using grep.
In this lesson we learn how to use the Linux wildcard. The wildcard allows you to automate what would otherwise be tedious tasks. The wildcard is the * character. For example, a command with *.txt would affect all files ending in .txt. Similarly, *.* would affect all files. You could also imagine dog*.txt would affect all files that start with “dog” and end with .txt. The video gives many examples of using the wildcard to simplify things.