Unix command to view the end of a file

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0
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2answers
23 views

Watching logs with less +F freezes after a while

less +F is a great command for watching logs, but it has very annoying issue. After a while it stops updating log file and requires restart. Is there any way to make it follow file forever?
0
votes
2answers
15 views

How to join files using 'tail' command while displaying limited lines

I have multiple log files and I want to display its joint output. One way of doing this is by executing this command: tail file-1 file-2 But I also want to display only a specific number of lines ...
0
votes
1answer
16 views

How to grep in tail in several files

I need to tail several files, and most info from them i removing (using grep). Now mine output dirty with file names. How i can remove them? Short to problem: $ tail -F /log/rest_server*.log | egrep ...
0
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0answers
24 views

Read binary file of expected size blocking until the size is equals expected

I want to read a dowloaded file while it is being written for instance with tail -f -c +1 $filename and to redirect it to another tool (which decodes it) with a pipe |. This works fine but I am doing ...
-1
votes
2answers
60 views

Tail, cat and grep a file at the same time

So I need to monitor a log file in linux and I'd like to cat the contents (to see all previous entries) as well as tail the log file while simultaneously using the grep to filter out the stuff I want ...
0
votes
1answer
16 views

Preserve colors with watch -n

I am running watch tail -n 15 20151217.log and my output looks like 12-17 04:42:52 DEBUG [31mXYZT 10 91.5[0m Instead, I want to see it as colored text. What can I do? I don't want to ...
0
votes
0answers
22 views

MS-DOS show a list of excecuted commands

I'm trying to see a list of commands which are executed in windows once I run a specific function within an application. So for example, if I was to use Ms Word to save a file, I would like to see a ...
0
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0answers
16 views

remove last n lines of command line output? [duplicate]

When I run cat duplicates.txt I get the entire contents of the file duplicates.txt. The end of the file appears right above my command prompt. I can conveniently copy and paste content from it to my ...
1
vote
1answer
17 views

How do I run Logstalgia if root login is disabled and ssh user doesn't have access to logs?

I'm trying to run Logstalgia, I think it's pretty awesome, and want to try it out. For security reasons I've disabled root login from my servers. My current user doesn't have access to the log files ...
-1
votes
1answer
138 views

command nohup tail with redirection in shell script not invoked properly under a particular situation

I have an issue where a tail command in bash script does not work correctly when called from remote by providing only 1 param out of 2 params. But it works correctly if: executed directly on local ...
1
vote
1answer
22 views

Find and replace in output of command based on file contents

I have a tail -f command reading a log containing IPs however I wish to replace these IPs with hostnames, I have the dhcpd.leases file available to the machine on which this is running. I have been ...
0
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0answers
30 views

Ctrl+c closes Remmina SSH connection instead of only log tail

I am using Remmina to connect to the linux machine over SSH to monitor logs of the application. I am using tail command to watch .log file. When I am trying to stop watching log by using ctrl + c ...
1
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0answers
87 views

Log tailing over SMB much slower under Samba 4 vs Samba 3

I just upgraded my internal development VM running Ubuntu 11.10 with Samba 3.6 to Ubuntu 15.04 with Samba 4.1 (fresh install, new VM). Everything is working great, with the exception that my log ...
0
votes
1answer
85 views

combining tail -f with less +F does not work

I am using ubuntu bash. I am trying to combine tail -f and less +F like below and nothing is coming out. tail -f long_running_log | less +F long_running_log is a log file constantly being written ...
18
votes
4answers
1k 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
97 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
62 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
330 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
18 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 => ...
0
votes
0answers
130 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 ...
0
votes
2answers
676 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
99 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 ...
0
votes
0answers
189 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
120 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?
1
vote
1answer
2k 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
37 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 ...
3
votes
1answer
322 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 ...
1
vote
2answers
227 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
88 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.
1
vote
1answer
4k 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
464 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
142 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 ...
2
votes
2answers
209 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: ...
1
vote
2answers
108 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
127 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 ...
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
1answer
4k 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 ...
0
votes
1answer
650 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
1k 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 ...
5
votes
3answers
2k 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. ...
2
votes
1answer
107 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
63 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?
2
votes
1answer
841 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 ...
3
votes
1answer
759 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: ...
0
votes
0answers
146 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 ...
11
votes
3answers
10k 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 ...
0
votes
2answers
232 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. ...
1
vote
1answer
70 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 ...
2
votes
1answer
255 views

Delete first lines from a Unicode html file

I have an HTML file that is in UTF-8 format and I want to remove the first five lines from it. I've tried using sed but it doesn't work in this case: sed "1,5d" Result.html>small2 It actually ...
1
vote
1answer
217 views

Is there a command-line tool that can read from a file and write the file's contents to stdout, blocking on EOF?

Is there anything like tail –f that also works well with binary files and supports exit conditions like "on pid X death" or so?