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Questions tagged [tail]

Unix command to view the end of a file

0
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1answer
36 views

tail -f over network with Putty

I want to see log files on a remote Linux machine on my network without having to manually ssh, cd to directory and tail -f the log file. I am using Windows and need to do this with Putty. Is there a ...
0
votes
1answer
47 views

Strip off previous lines in tail or less

I'm using tail -f or less +F to observe a changing log-file. I know from a certain point the lines I'm looking for are going to appear. So all that garbage before that point I don't require and would ...
0
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1answer
98 views

How to remain in session after exiting tailf command from remote script

Have PowerShell script from which I am executing the following command: putty.exe -ssh user@srv -pw password -m Execute_Command_File -t During the script, tailf /dir/log/ command is written into ...
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1answer
313 views

how to tail into the last file on a remote server via ssh

background I always tail logs (both error and info).. which requires the following manual steps 1. ssh into a server 2. cd into the logs directory 3. identify the last file that is either error or ...
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2answers
116 views

How to tail file from url without downloading the entire file?

I've got a system which needs to get the latest 200 lines from a very large public file every day. The file is exposed over an url. Currently I run a simple script which does a wget and then tails the ...
3
votes
1answer
319 views

How do I tail a block device in Linux?

I am trying to get just the last 1024 bytes of /dev/sda2. When I do sudo tail -c 1024 /dev/sda2 | hd, the prompt just hangs until I hit Ctrl-C. However, when I tail -c 1024 ddfilecopyofsda2 | hd, I ...
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2answers
31 views

Tail and strip unwanted content from each line

I've got a log that contains data I don't need and want to tail it and strip the data so that this: [Tue Nov 07 2017 14:44:51 GMT+0100 (CET)] INFO :CREATE [Tue Nov 07 2017 14:44:51 GMT+0100 (CET)] ...
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1answer
345 views

How to “tail” multiple pipe files or streams?

I need to monitor a lot of web servers for runtime errors and I have an idea of running a script like #!/bin/bash -e # Example set of hosts HOSTS=( host1 host2 ) for host in ${HOSTS[@]} do [...
2
votes
1answer
36 views

Separating files in watch command

I have 3 files and I want watch the changes of these files with 'watch' command. But these 3 files have a lot of row and I just want see the last 3 rows with 'tail'. There is no problem at here. I can ...
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0answers
81 views

Use Cygwin to tail multiple files

I would like to tail multiple files into the same window so that they are intermingled. When I try the following: tail -f logA.log logB.log I get the following: usage: TAIL [switches] [filename]...
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1answer
339 views

Grep with multiple patterns used on the command

A few days ago I installed Centos 7 on my server and run ssh. Now I want to track logs. Is there anyway to combine cat or tail with grep to have clear failed and accepted login attempts list from a ...
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2answers
356 views

Monitor log live for error. If error = rerun command and restart log monitoring, if not found = keep monitoring forever

A process in a bash script I'm developing often fails quietly (it keeps running with no error code, but it writes the error in its log file). As soon as the error appears in the log file I want the ...
0
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1answer
5k views

tail/head all line except X last/first Lines

for example i have this file : cat myfile 1 2 3 4 5 i want to print all lines except first 2 line . output should be like this : tail -n $(( $(wc -l myfile | awk '{print $1}') - 2 )) myfile 3 4 5 ...
1
vote
1answer
246 views

Is it possible to tail both file and journalctl using the same console?

I am looking for a solution for tailing not only multiple files in parallel but also the journalctl. Multitail seems to do a pretty good job but I don't know a way to make it work with journalctl.
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2answers
29 views

display number of files in current moment like what tail -f do

I have a folder which files are copied to it like /home/my/. I want to run a command which shows number of files inside it in real time like what tail -f do with file contents. I know I should run ls *...
2
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0answers
998 views

How do I tail Windows 10 Update Log

I have a following batch file that runs on startup wuauclt.exe /detectnow /updatenow start /min C:\Windows\WindowsUpdate.log But now in Windows 10 log file simply has the following Windows Update ...
-1
votes
1answer
296 views

Tail logs and use grep to exclude specific lines

I have this line that appears every minute in my log file: 2016-03-29 21:52:46,226 INFO 200 GET /api/ping (0.0.0.0) 0.34ms I want to tail this log file without showing these lines. I tried: ...
59
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6answers
5k views

Alternative for “tail -f” that follows filename

I have some logs being generated using a timed rotating file logger. This logs to a file called tool.log, and at midnight, moves this to tool.log.<date> and starts a new tool.log. I have a tail ...
1
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2answers
82 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?
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2answers
187 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
42 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 -...
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2answers
2k 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 ...
1
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1answer
83 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 use ...
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0answers
84 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 ...
1
vote
1answer
111 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 ...
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votes
1answer
910 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
54 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 ...
3
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0answers
246 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 ...
1
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1answer
489 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
2k 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
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1answer
750 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 ...
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0answers
178 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 cases:...
2
votes
1answer
1k 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 ...
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0answers
24 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 => stdClass:...
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0answers
378 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 ...
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2answers
3k 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 ...
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1answer
212 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 ...
1
vote
1answer
566 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
456 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
3k 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 find ...
3
votes
3answers
74 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 ...
4
votes
1answer
745 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
887 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
246 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.
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1answer
12k 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. ...
5
votes
1answer
2k 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
332 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
825 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: http://www.ogimet.com/cgi-bin/getsynop?begin=...
1
vote
2answers
307 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
203 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 ...