Unix command to view the end of a file

learn more… | top users | synonyms

11
votes
14answers
19k views

Monitoring a file until a string is found

I am using tail -f to monitor a log file that is being actively written to. When a certain string is written to the log file, I want to quit the monitoring, and continue with the rest of my script. ...
18
votes
4answers
752 views

Linux command line log viewer which allows auto tail AND searching?

I use tail -f in my Linux shell, to view log files, as I like how it auto-updates with the incoming text: I like to see the new stuff come scrolling in. However, I also like the search functionality ...
0
votes
1answer
39 views

How to grep for line numbers in a binary file?

I'm on Centos 5 Linux and using GNU grep v2.5.1 and looking at a 36GB log file. It is huge and I need to find around a million lines starting from the occurrence of a string 6307459 in the log file ...
1
vote
0answers
45 views

Can vim be used to view a growing file?

I often use vim's view for viewing files. Is there a way to use it for a growing file so that I can see the progress as it's happening? Something similar to tail -f or less +F I have two use ...
1
vote
1answer
52 views

piping tail -f into sed or awk

There is another question which is nearly the same, but none of the suggestions from its answer works for me: Piping tail -f into awk I'm trying to tail -f a logfile but want to replace \r with \n ...
0
votes
0answers
13 views

Is there a way to make tail output newlines?

When I do tail -f $file I see newlines as \n. For example: permissions array(\n 0 => \n stdClass::__set_state Is there a way to make it turn into permissions array( 0 => ...
1
vote
2answers
962 views

How to find the last match of a string in a bunch of files

I have a bunch of files, I'd like to find the last match of a string in each of them. grep text *.file gives me all the matches not the last ones. ls *.file | xargs grep text | tail -n 1 gives me ...
0
votes
0answers
62 views

Copy huge file skipping first line using dd in Linux

I was trying to copy the content of a huge file (10GB) to another skipping the first line (as in head -n1). I tried multiple ways of head, tail, awk and sed. Settled on using tail -n+2 > ./xab.1 ...
-1
votes
1answer
160 views

Scrolling in terminal (OS X) when running tail -f and ssh-ed into a machine yields some strange characters

I'm ssh-ed into a remote machine and running tail -f. Every time I scroll up/down using the trackpad, it yields some strange characters, like OB^[OB^[OB^[OB^[OB^[OOB^[OB^[OB^[OB^[OB^[O This didn't ...
0
votes
1answer
38 views

Why chain of commands that runs fine on local doesn't run on SSH?

There's something funny with tail -f and grep -o combination when running over ssh. So on local server, if you do tail -f /path/myfile.log |grep -o keyword It grep just fine. But if you run it on ...
3
votes
3answers
3k views

multitail for Windows cmd/powershell?

Is there a program like multitail but for Windows cmd.exe or powershell (not GUI)?
0
votes
0answers
58 views

Insert blank lines when using 'tail -f' in cmder

I recently switched from Cygwin to cmder mostly due to it's awesome interface and all that cool pre-configured stuff. ( http://bliker.github.io/cmder/ ) I am using tail -f very often and when I am ...
6
votes
1answer
72 views

tail -f file stops tailing on rename

I want to tail -f file but going tailing it after a mv. The tail manpage tells me: -f means --follow=descriptor so a mv should not change the inode? Why does tail -f stop working after the rename?
2
votes
1answer
141 views

tail a file without wrapping the lines on a mac

I want to tail -f a file that may contain very long lines. I would also like to see one line per screen line and scroll to the side if necessary, much like Vim's zL and zH, so no line wrapping, Is ...
6
votes
2answers
2k views

Equivalent of 'clear' command when using tail -f

I am using the tail -f command to follow an error log, and I often want to "clear" the terminal, much in the same way that the clear unix command moves everything above the top of the window. Is there ...
10
votes
2answers
3k views

Using 'head' or 'tail' on HUGE text file - 19 GB

I have a problem with viewing chunks of a very large text file. This file, approximately 19 GB, is obviously too big to view by any traditional means. I have tried head 1 and tail 1 (head -n 1 ...
1
vote
1answer
59 views

What's the best way to view lines X through Y of a large file?

I have a very large text file and I want to view, say, lines 2000 through 2010 (with the line numbers included) I know one sort of roundabout way of getting there: sc -l [file] cat -n [file] | tail ...
4
votes
1answer
3k views

How to easily break up a text file into pieces smaller than a threshold?

I have some text files that are 100 to 300 MB in length that I want to view in Emacs, but my Emacs gets into some performance issues opening and traversing such large files. Therefore, I'm looking ...
4
votes
3answers
1k views

Is there anyway to `cat` two remote `tail -f` streams via SSH?

I wanted to combine two continuous text streams generated by tail -f into one and watch them in the same screen. Is it possible? Both text streams are line-oriented (e.g. logs), if that helps. ...
1
vote
1answer
399 views

Tail the filename, not the file

In UNIX (OS X BSD to be precise), I have a "tail -f" command on a log file. From time to time I want to delete this log file so I can more easily review it in my text editor. I delete the file, and ...
11
votes
1answer
13k views

Combine tail -f with grep?

Hi I wanna keep looking at a log file, but I also don't wanna see irrelevant stuff, I'm only interested in anything with "foobar" in it. So if I was tailing the file I would do tail file | grep ...
6
votes
2answers
939 views

Is there a tail -f equivalent for ls?

Basically the question is in the title. I want to monitor a directory for new files that are written or deleted, the way I can monitor a log file with tail -f. Is this possible?
3
votes
2answers
1k views

Filter tail command through multiple grep commands to separate files

What I am trying to do is filter the output of one log file into separated log files based on a grep filter. tail -f test.log | tee >(grep "Error" > error.log) >(grep "Warning"" > warning.log) ...
4
votes
3answers
1k views

Tail multiple files while piping one of the files through grep

I want to use tail follow two log files, but one of the log files has too much data, so I want it filtered with grep. tail -f file1 file2|grep mySearch The issue with this is that both files are ...
1
vote
1answer
1k views

Other ways to increase max open files?

I have an application which keeps giving me the following error. tail: inotify cannot be used, reverting to polling: Too many open files I have already followed all the advice I've been able to ...
2
votes
2answers
33 views

Discard content of logfile, keeping tail

I'm looking for a way how to discard content of the logfile, leaving only defined tail. In two steps it's quite easy: tail -n1000 alert_migtst.log > alert_migtst.tail mv -f alert_migtst.tail ...
76
votes
10answers
48k views

Is it possible to `tail -f` the output of `dmesg`?

Want to do something like dmesg | tail -f but it doesn't work: I use Mac OSX 10.6.7, by doing that the tail will exit, instead of monitoring the output. I wonder if there is any way to do it, or ...
1
vote
2answers
648 views

tail stops working

I am tailing a file in unix. It stops working sometimes and I have to re-run the command. Anyone know why this happens?
1
vote
2answers
133 views

Tail and grep recursively?

Trying to tail though a list of domains to search for a hacker code. All the files that I'm looking for are the same so I was trying something like this: grep -rnl * -e "Ai9LbaFz7lC13SwzDxAYT72vwA" ...
1
vote
3answers
61 views

Is it possible to tail -f an external web resource?

Can I tail -f an output from http://example.com? I want to monitor external JSON file.
34
votes
2answers
6k views

Using watch with pipes

I'd like to run this command: watch -n 1 tail -n 200 log/site_dev.log | grep Doctrine But it does not run, because "I think" that the grep tries to run on the watch instead of the tail... Is there ...
1
vote
1answer
2k views

Extract the contents of ELF and write to binary file

I have been trying to extract the contents of a firmware and putting it to a binary file, but with no success. I see the right hex contents, but am not sure how to laid them in bits into a file. ...
4
votes
1answer
105 views

Unix /Linux show the last part of a file with line numbers

Is there a way to make tail show a line number in front of the last lines it show so that it show the growth of the file when using it in a script. e.g: when using it in a script like this one: ...
2
votes
1answer
112 views

Why tail -f is not working for a proc file?

I have a proc file which is updated by a driver. In user space I am reading using tail. It is working fine, But when i give -f option for tail, It is not working. This means it is reading file ...
1
vote
2answers
179 views

Is there any tail like tool supporting WebDav

My problem is that that a proprietary SaaS platform im developing on/for only provides log files via WebDav. During development this log files can get quite large by the end of the day (think 200 Mb+) ...
2
votes
2answers
137 views

Use tail directly on website data, or another utility needed?

I am planning to extract a single field of data from the last line of data on a website to populate an RRD database. I'm running Linux. The website is: ...
0
votes
2answers
73 views

display whole stream while highlighting with grep

I often use tail -f | grep someregex on log files. I have grep liased to grep ---color=auto so my matches are highlighted. If I want to see my matches in the context of the whole stream, how would I ...
0
votes
1answer
108 views

Running `tail -F $file` then removing outputted lines

Long story short; I'm running this command to stream a forever growing audio file audio.mpg into ffmpeg tail -F audio.mp3 | ffmpeg -i - http://127.0.0.1:8090/feed1.ffm audio.mp3 is being SSH'd from ...
0
votes
1answer
437 views

Installing Multitail on RHEL 5.3

I'm trying to install Multitail on a RHEL 5.3 machine, but get the following error as the root user. Should this be accessible from one of the default RPM repositories or do I need to add a new ...
1
vote
3answers
987 views

Coloured output when tailing php error log

I'm trying to find a way (through escape characters or software) to display coloured lines in my php error log. Right now I'm reading from them (live) with tail -n 50 -f /var/log/apache2/error.log ...
0
votes
2answers
204 views

Issues with Multitail 5.2.11 Install on RHEL5.3

I'm having some difficulty getting Multitail installed on a Linux box. Their site mentions that Multitail requires the ncurses library, but systems like *BSD and Linux have this library by default. ...
2
votes
1answer
644 views

How to display/monitor the tail of a growing CSV file in tabular format?

I am looking for a way to display an open, "live" CSV file under Windows 7. For example, I have a proprietary program running that is generating log data in CSV format. I'd like to keep an eye on what ...
2
votes
1answer
95 views

quick tail on a huge file on linux

I need to get the last 10 million lines of a 100 million lines file. tail -n 10000000 $in_file>$out_file however the above command took more than 1 day and is still going. I guess I can use the ...
2
votes
2answers
58 views

How quickly is the log file growing?

I use `tail -f logfile' to view the log in real time. I also need to know how many lines are appended to the logfile per second. Is there a command to do this?
4
votes
5answers
1k views

Linux application to tail multiple log files (like OS X Console.app)

I'm constantly tailing log files. At any given time I've got half a dozen terminal windows open that are simply running tail -f . In OS X, the Console app is brilliant. All the usual log files are ...
3
votes
1answer
595 views

How to monitor files matching a wildcard with multitail

I have a 'logs' directory full of log files whose names follow this format: XXX-YYYY-DATE-N.txt where N is a number that grows bigger as time goes on. So for example right now I have: ...
2
votes
3answers
615 views

How to grab a random section in the middle of a huge file?

I have a huge log file of around 3.5 GB and would like to sample random sections in the middle of say 10 MB for the purpose of debugging what my application is doing. I could use head or tail ...
2
votes
2answers
1k views

Realtime linux colored tail with filtering support for tomcat?

I am looking for a tail, gui or console based, that would be able to filter and color messages from tomcat based on their level: INFO, WARN, ERROR, CRITICAL. Another feature that is quite importat ...
0
votes
0answers
139 views

Tail for Powershell v3?

I'm running the following command in my powershell terminal: Get-Content C:\wamp\bin\apache\apache2.2.22\logs\lysol-dbau.access.log -Tail 10 -Wait So I want to start with the last 10 lines of the ...
9
votes
2answers
6k views

Opposite of tail: all lines except the last n lines

How can I discard the last n lines of a file with a unix command line filter? That would be sort of the opposite of tail: tail discards the first n lines but pipes the rest through, but I want the ...