The `tail` command is typically used in Unix/Linux systems or...

The tail command is typically used in Unix/Linux systems or scripting. It is not code, but a command-line utility.

The tail command is used to display the last few lines of a file by default or follow the output of a file in real-time as it gets updated.

Here’s what it does:

1. Default behavior: By default, tail shows the last 10 lines of a specified file.

   tail filename
   

2. Specify the number of lines: You can specify the number of lines to display using the -n option.

   tail -n 20 filename
   

   This example shows the last 20 lines of the given file.

3. Follow the file in real-time: Using the -f option, tail can keep monitoring the file for new lines and display them as they are appended (useful for log files).

   tail -f filename
   

4. Combination of options: You can combine options like specifying the number of lines to display initially while following the file.

   tail -n 50 -f filename
   

   This shows the last 50 lines of the file and follows it in real-time.

In summary, the tail command is used for reading the end of files or monitoring files as they update.