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How does the tail commands -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) Use --follow=name in that case That causes tail to track the
What is the difference between tail -f and tail -F? Tail will then listen for changes to that file If you remove the file, and create a new one with the same name the filename will be the same but it's a different inode (and probably stored on a different place on your disk) tail -f fill not retry and load the new inode, tail -F will detect this
What does tail -f do? - Unix Linux Stack Exchange 7 It means tail -f command will wait for new strings in the file and show these strings dynamically This command useful for observing log files For example try, tail -f var log messages
Show tail of files in a directory? - Unix Linux Stack Exchange A simple pipe to tail -n 200 should suffice Example Sample data $ touch $(seq 300) Now the last 200: $ ls -l | tail -n 200 You might not like the way the results are presented in that list of 200 For that you can control the order of the results that ls outputs through a variety of switches For example, the data I've generated is numeric
How do I read the last lines of a huge log file? tail --bytes 100M logfile log | tail However, if you're using GNU Coreutil¹'s tail implementation, that already does this (i e , it seeks to the end of the file minus 2 5 kB, and looks from there) By not abusing cat here but letting tail read the file itself (or just using redirection, works the same!) instead, you get a much faster result
How to monitor only the last n lines of a log file? Here is what I know I can do: tail -n 15 -F mylogfile txt As the log file is filled, tail appends the last lines to the display I am looking for a solution that only displays the last 15 lines and get rid of the lines before the last 15 after it has been updated Would you have an idea?
How to obtain inverse behavior for `tail` and `head`? You can use this to strip the first two lines: tail -n +3 foo txt and this to strip the last two lines, if your implementation of head supports it: head -n -2 foo txt (assuming the file ends with \n for the latter)
How do I tail a log file and keep tailing it when the latest one . . . tail monitors a single file, or at most a set of files that is determined when it starts up In the command tail -F file_name* log, first the shell expands the wildcard pattern, then tail is called on whatever file (s) exist at the time To monitor a set of files based on wildcards, you can use multitail multitail -iw 'file_name* log' 1