What is the `tail` command?

The tail command in Linux is a utility used to display the last part of a text file. By default, it shows the last 10 lines of the specified file. It is commonly used for monitoring log files and other files that are continuously updated.

Here are some common usages of the tail command:

1. Display the last 10 lines of a file:

   tail filename.txt

2. Display a specific number of lines from the end of a file:

   tail -n 20 filename.txt

   This command shows the last 20 lines of filename.txt.

3. Monitor a file in real-time (useful for logs):

   tail -f filename.txt

   This command will continuously display new lines added to filename.txt as they are written.

The tail command is a powerful tool for system administrators and developers for troubleshooting and monitoring purposes.