How can you check appended content?

To check content that you have just appended to a file, the best tool is usually the tail command.

Since >> adds data to the very bottom of a file, tail is perfect because it shows you the end of the file.

1. Using tail (The most common way)

By default, tail shows the last 10 lines of a file.

tail filename

If you want to see exactly how many lines you just added (for example, the last 3 lines), you can specify the number:

tail -n 3 filename

2. Using cat (For small files)

If the file is short, simply using cat is the fastest way to see everything, including the new part at the bottom:

cat filename

3. Monitoring in Real-Time (The "Live" way)

If you are running a script or a command that keeps appending data (like a log file), you can use the follow flag:

tail -f filename

This is very cool because the terminal will stay open and automatically update on your screen every time a new line is appended to that file. (Press Ctrl + C to stop watching).

4. Searching for the New Content

If you know a specific word that appeared in the content you appended, you can use grep:

grep "your_word" filename

Pro Tip: If you just used cat file1 file2 >> total_file, you can verify the append worked by comparing the line count before and after using wc -l total_file (which counts the number of lines).