Sometimes, we want to get last n lines of a file, similar to tail with Python.
In this article, we’ll look at how to get last n lines of a file, similar to tail with Python.
How to get last n lines of a file, similar to tail with Python?
To get last n lines of a file, similar to tail with Python, we can run tail with Popen.
For instance, we write
import subprocess
def tail(f, n, offset=0):
proc = subprocess.Popen(['tail', '-n', n + offset, f], stdout=subprocess.PIPE)
lines = proc.stdout.readlines()
return lines[:, -offset]
to create the tail function that runs tail with the arguments to return the last n lines from file with path f.
And then we set stdout to subprocess.PIPE to return the output.
Next, we call proc.stdout.readlines to get the output and return it.
Finally, we use lines[:, -offset] to get the list with the last n lines.
Conclusion
To get last n lines of a file, similar to tail with Python, we can run tail with Popen.
