Viewing Content
Search & Pipes
Filter output and chain commands together.
grep searches text: grep "error" app.log.
The pipe | sends one command's output into the next:
ls -la | grep ".txt" lists only lines containing .txt.
Combine with wc -l to count lines: grep "TODO" *.md | wc -l.
$ Commands to try
$ grep "practice" notes.txt
$ ls | grep .txt
$ cat notes.txt | wc -l
$ history | grep cd
Practice exercise
List files in your practice folder and pipe to grep to find only .txt files.