Lesson 11: Searching Text with grep

Files can be huge. Instead of reading everything, `grep` finds for you only the lines containing a certain word. It's like Ctrl+F, but for the terminal — and much more powerful.

grep is asking a friend: "read the whole book and tell me only the lines that mention this word".

grep: A command that finds lines containing certain text
Pattern: The word or text grep searches for
Case-insensitive (-i): grep -i ignores the difference between upper and lower case