In this blog post, we will explore the tail
command, a highly useful tool in the UNIX command line. This command is available on most Unix-like systems, including macOS and Linux.
According to the tail
command’s man page, it allows us to display the last part of a file. Here is an example screenshot of the man page for reference.
One common usage of the tail
command is to display a specific number of lines from the end of a file using the -n
option. For instance, executing the following command will display the last 2 lines of a given file:
tail -n 2 <filename>
However, my primary use case for tail
is to monitor a file for new content. This can be achieved by using the -f
option. By executing the following command, tail
will continuously monitor the specified file for changes:
tail -f <filename>
This is particularly handy when dealing with scripts that fetch remote data and append the results to a text file. Using the tail -f
command on the results.txt
file, I am able to track incoming data in real-time.
In conclusion, the tail
command is a versatile tool for monitoring file content. Whether you need to view the last lines of a file or monitor it for changes, tail
is a reliable companion in the command line toolkit.