I believe the problem here is that the first grep is buffering the output which means the second grep won’t see it until the buffer is flushed. Try adding the –line-buffered option on your first grep: tail -f access_log | grep –line-buffered “127.0.0.1” | grep -v “.css” For more info, see “BashFAQ/009 — What is … Read more
The tail utility is part of the coreutils on linux. Source tarball: ftp://ftp.gnu.org/gnu/coreutils/coreutils-7.4.tar.gz Source file: https://git.savannah.gnu.org/cgit/coreutils.git/tree/src/tail.c (original http link) I’ve always found FreeBSD to have far clearer source code than the gnu utilities. So here’s tail.c in the FreeBSD project: http://svnweb.freebsd.org/csrg/usr.bin/tail/tail.c?view=markup
I use this function all the time to monitor a log file in another terminal window. tail -f <filename> I recommend taking it a step forward to look for particular text in the log. Great if you are only interested in seeing some particular entry being written to the file. tail -f <filename> | grep … Read more
If you have PowerShell 3 or higher, you can use the -Tail parameter for Get-Content to get the last n lines. Get-content -tail 5 PATH_TO_FILE; On a 34MB text file on my local SSD, this returned in 1 millisecond vs. 8.5 seconds for get-content |select -last 5
GNU (Linux) uses the following: tail -n 10 <logfile> | tac tail -n 10 <logfile> prints out the last 10 lines of the log file and tac (cat spelled backwards) reverses the order. BSD (OS X) of tail uses the -r option: tail -r -n 10 <logfile> For both cases, you can try the following: … Read more
Use tac, so you dont have to read the whole file: tac FILE |egrep -m 1 .
Tail for Win32 is a simple open-source program I’ve been using for a couple of years already. Notepad++ can actually do it out of the box. From within Notepad++: Settings > Preferences > MISC. From there, you can check “Update silently” and “Scroll to the last line after update” in the group “File Status Auto-Detection”
Have you tried ssh -t remotemachine <some command> -t option from the ssh man page: -t Force pseudo-tty allocation. This can be used to execute arbitrary screen-based programs on a remote machine, which can be very useful, e.g. when implementing menu services. Multiple -t options force tty allocation, even if ssh has no local tty. … Read more
Put the tail inside the capturing parens. OUTPUT=$(exif … | tail -1) You don’t need the double quotes here. I’m guessing that you tried OUTPUT=”$(exif …) | tail -1″
To log all the files inside a folder, you can go to the folder and write tail -f *.log To add the subfolders to the tailf command, use tail -f **/*.log Of course, the regular expression can be improved to match only specific file names.