Get last n lines of a file, similar to tail
I’m writing a log file viewer for a web application and for that I want to paginate through the lines of the log file. The items in the file are line based with the newest item at the bottom.
tail
How can I tail a log file in Python?
I’d like to make the output of tail -F or something similar available to me in Python without blocking or locking. I’ve found some really old code to do that here, but I’m thinking there must be a better way or a library to do the same thing by now. Anyone know of one?
How to implement a pythonic equivalent of tail -F?
What is the pythonic way of watching the tail end of a growing file for the occurrence of certain keywords?
Head and tail in one line
Is there a pythonic way to unpack a list in the first element and the “tail” in a single command?
Command to display first few and last few lines of a file
I have a file with many rows, and each row has a timestamp at the starting, like
monitor files (à la tail -f) in an entire directory (even new ones)
I normally watch many logs in a directory doing tail -f directory/*.
The problem is that a new log is created after that, it will not show in the screen (because * was expanded already).
Best way to follow a log and execute a command when some text appears in the log
I have a server log that outputs a specific line of text into its log file when the server is up. I want to execute a command once the server is up, and hence do something like the following:
continuous reading from named pipe (cat or tail -f)
I have configured rsyslog to log certain log events to /dev/xconsole:
Output file contents while they change
I want to output a file’s contents while they change, for example if I have the file foobar and I do:
Does tail read the whole file?
If I want to tail a 25 GB textfile, does the tail command read the whole file?