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Bookmark or Share- How to quit `tail -f` mode without using `Ctrl+c`?Answers differ based on context. To quit tail -f elegantly, you will need a trigger. Assume you are trying to monitor output of a task that will finish at some point in time - that can become your trigger. task >& filename.log & task_pid=$! tail -f filename.log & tail_pid=$! while [ 1 ] do # -0 is a special "poke" signal - "are you around?"
- tail - cat line X to line Y on a huge file - Unix & Linux Stack ExchangeIn addition, tail will not read any more than head, so thus we have shown that head | tail reads the fewest number of lines possible (again, plus some negligible buffering that we are ignoring). The only efficiency advantage of a single tool approach that does not use pipes is fewer processes (and thus less overhead).
- How does the "tail" command's "-f" parameter work?From the tail(1) man page: With --follow (-f), tail defaults to following the file descriptor, which means that even if a tail’ed file is renamed, tail will continue to track its end. This default behavior is not desirable when you really want to track the actual name of the file, not the file descrip- tor (e.g., log rotation).
- How to do a `tail -f` of log rotated files?tail -F /var/log/kern.log The -F option tells tail to track changes to the file by filename, instead of using the inode number which changes during rotation. It will also keep trying to open the file if it's not present.
- What is the difference between "tail -f" and "tail -F"?tail -f fill not retry and load the new inode, tail -F will detect this. The same effect will happen if you rename/move a file. If you for example follows /var/log/messages and logrotate rotates the log to /var/log/messages.1. tail with -f will still listen to the old inode that points to messages.1. tail with -F will realize this and read the ...
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