Tail trunk motorcycle. log | grep -m 1 "^Finished: " | grep -q "SUCCESS$" -m <number> tells grep to stop after number matches and the grep -q exit status will only be 0 if SUCCESS is found at the end of the line If you want to see all the 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. Example Sample data. tail -f my-file. The output from tail to a pipe will be line-buffered. tail -f fill not retry and load the new inode, tail -F will detect this. $ 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. g. To print all the initial lines and all following, use tail -n +1 -f file. This default behavior is not desirable when you really want to track the actual name of the file, not the file descrip- tor (e. , it seeks to the end of the file minus 2. Use --follow=name in that case. The point is that tail -f file1 file2 doesn't work on AIX where tail accepts only one filename. For example, the data I've generated is numeric. You can do (tail -f file1 & tail -f file2) | process to redirect the stdout of both tail s to the pipe to process. For that you can control the order of the results that ls outputs through a variety of switches. 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. However, whatever is reading that pipe may not flush its own output, so there may be delays in the output of those results. 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). , log rotation). Tail will then listen for changes to that file. Is there away to print those while only using head, tail and pipe commands AND Feb 20, 2024 · tail --bytes 100M logfile. Dec 17, 2023 · How to tail -f multiple files and grep each file individually in single output? Ask Question Asked 2 years, 2 months ago Modified 2 years, 2 months ago Dec 29, 2023 · tail -n +1 -f myFile Some versions of tail also accept a numeric option directly, like tail -5 or tail +5, but that is non-POSIX. log | grep -qx "Finished: SUCCESS" -q, meaning quiet, quits as soon as it finds a match -x makes grep match the whole line For the second part, try tail -f my-file. e. log | tail However, if you're using GNU Coreutil¹'s tail implementation, that already does this (i. Oct 17, 2023 · I have to grab the first two lines, the lines 43 and 44, and the last 2 lines from a file in one conduct of commands. log | grep -m 1 "^Finished: " | grep -q "SUCCESS$" -m <number> tells grep to stop after number matches and the grep -q exit status will only be 0 if SUCCESS is found at the end of the line If you want to see all the . 5 kB, and looks from there). Dec 22, 2022 · tail -f file prints the last 10 lines that were initially in the file and waits and prints all the additional lines that come thereafter. That causes tail to track the A simple pipe to tail -n 200 should suffice. 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. fupqancxgxqmznewnzhfkgtiiixpmikeyhmhzaqhhqarr