Output the last part of files.
Output the last part of files, print the last part (10 lines by default) of each FILE; tail reads from standard input if no files are given or when given a FILE of `-'.
Questions tagged [tail]
96 questions
2
votes
3 answers
tail -f and then exit on matching string
I am trying to configure a startup script which will startup tomcat, monitor the catalina.out for the string "Server startup", and then run another process.
I have been trying various combinations of tail -f with grep and awk, but haven't got…
Patrick
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- 10
2
votes
1 answer
Multitail configuration:defaultcscheme isn't applied
Finally i got Multitail to work. The only problem is the Default Colorscheme isn't applied to a file i open with multitail, so have to go to the menu and apply it manually.
My multitail.conf looks like this…
user56548
2
votes
2 answers
Bash edit file and keep last 500 lines
I am looking to create a cron job that opens a directory loops through all the logs i have created and deletes all lines but keep the last 500 for example.
I was thinking of something along the lines of
tail -n 500 filename > filename
Would this…
icelizard
- 732
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2
votes
1 answer
Tail log files on multiple servers
Scenario: I have load balanced servers running a web application. To debug I'd like to see the output of the same log file (such as the nginx log) combined into a single stream, e.g. a tail -f on all servers in the same cluster, where one of them is…
Peter Thoeny
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- 5
2
votes
3 answers
How to truncate the log file size without losing recent logs?
I want to reduce the log file size to the particular minimum size
I tried the truncate command as below
$ truncate -s 20M log filename
But when I check the truncated file it truncates the recent logs and keeps the old logs
When analyzing further I…
jayaprakash R
- 21
- 1
- 5
2
votes
1 answer
tail command retry flag not working with wildcards?
I want to tail a bunch of unknown directories names containing a particular non-existant file, e.g.:
tail -F /tmp/*/app.log
However that does not work as intended with the wildcard: if I create a file with that path, tail won't start following…
iomv
- 123
- 4
2
votes
1 answer
Cron is not running from docker container... failed
I am trying create cron a task in docker container. Everything are configured according to the @VonC 's answer
My dockerfile looks like this
FROM python:3.6.9
WORKDIR usr/src/mydir
COPY requirements.txt .
# Add crontab file in the cron…
Shokan Iliyas
- 21
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- 3
1
vote
0 answers
Convert json file to prometheus metrics
I have nginx json access log like this, a file that append sample like this to end of file.
{
"time": "2019-11-27T08:23:39+00:00",
"msec": 1574843019.787,
"ip": "91.133.248.69",
"agent_name": "firefox",
"agent_version": "70",
"agent_os":…
Mohammad Hossein Fattahizadeh
- 471
- 1
- 9
- 27
1
vote
0 answers
SSH session terminates while tail -f running
For the past year or so, I have found that if I leave a 'tail -f' command running in my terminals for more than a few minutes, the SSH session will disconnect. Before the disconnection occurs, the terminal starts to become sluggish in so much as…
John Rix
- 133
- 6
1
vote
2 answers
sed removing line breaks tail
In my Python script I needed a fast/efficient way to set a max filesize on a file I'm constantly writing to. Rather than bring the whole thing into py's RAM, I ran this shell command:
sed -i '1d' file.csv
I monitor the filesize periodically and run…
xendi
- 414
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- 22
1
vote
1 answer
Tail a massive log file in Windows
Inherited an IIS server when I started a new job. The previous "admin" had no log management policy in place. I'm now staring at a 56GB .log file that was created by a piece of software running in the background. I'm looking for a way to cut the log…
UnS3eN
- 61
- 6
1
vote
2 answers
Console File Color
Asterisk is generating a log file with following content:
#033[1;31mWARNING#033[0m[10505]:#033[1;37mres_phoneprov.c#033[0m:#033[1;37m1232#033[0m…
Ilie Soltanici
- 115
- 3
1
vote
1 answer
Tail application for windows that will track a file across newly created folders
I am working with a product, that every time its windows service is restarted, it creates a new folder with date and timestamp, and starts logging into files in this folder.
I am looking for a tail program, that will allow me to tail the…
LarsWA
- 151
- 4
1
vote
0 answers
Grep error or limitation reached on 1.2GB text file?
grep on large file followed by tail produces incorrect result, see proof below. The file is 1.2GB large, but grep should process it as a stream, so where could be a problem?
root@condor1796 /home/glassfish/apache-tomcat-8.5.5/logs # tail -n 20000…
Mladen Adamovic
- 599
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1
vote
1 answer
Using tail -F for monitoring huge file
I came across a requirement where I need to continuously monitor a live (appending) file for a predefined pattern (say a error message), I'm planning to use tail -F [FileName] | grep "pattern" & put it in some shell script to notify me. My concern…
vasco.debian
- 306
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