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Full Discussion: How to tail sed and awk in one line?
Top Forums Shell Programming and Scripting How to tail sed and awk in one line? Post 302983556 by RavinderSingh13 on Thursday 13th of October 2016 02:08:06 AM
Old 10-13-2016
Hello baris35,

If you want to continuously read the lines and search for a string and put that's matched line's first field to an output_file then following may help you too in same.
Code:
tail -f /var/log/apache2/access.log | awk '/TEST1/{print $1 >> "Output_file"}'

When you are done with tailing the logs(You could come out of above command) then you could check the file named Output_file for matched logs.

NOTE: In above command you could change search string from TEST1to your required text.

Thanks,
R. Singh
Last edited by RavinderSingh13; 10-13-2016 at 06:59 AM.. Reason: Added more clear comment "come out of that command" so that I could justify my statement "when you are done with tailing log"
This User Gave Thanks to RavinderSingh13 For This Post:
baris35
 

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LEARN ABOUT CENTOS

varnishtop

VARNISHTOP(1)															     VARNISHTOP(1)

NAME

       varnishtop - Varnish log entry ranking

SYNOPSIS

       varnishtop [-1] [-b] [-C] [-c] [-d] [-f] [-I regex] [-i tag] [-n varnish_name] [-r file] [-V] [-X regex] [-x tag]

DESCRIPTION

       The  varnishtop	utility  reads	varnishd(1) shared memory logs and presents a continuously updated list of the most commonly occurring log
       entries.  With suitable filtering using the -I, -i, -X and -x options, it can be used to display a ranking of requested documents, clients,
       user agents, or any other information which is recorded in the log.

       The following options are available:

       -1     Instead of presenting of a continuously updated display, print the statistics once and exit. Implies -d.

       -b     Include log entries which result from communication with a backend server.  If neither -b nor -c is specified, varnishtop acts as if
	      they both were.

       -C     Ignore case when matching regular expressions.

       -c     Include log entries which result from communication with a client.  If neither -b nor -c is specified, varnishtop acts  as  if  they
	      both were.

       -d     Process old log entries on startup.  Normally, varnishtop will only process entries which are written to the log after it starts.

       -f     Sort  and  group	only  on the first field of each log entry.  This is useful when displaying e.g. stataddr entries, where the first
	      field is the client IP address.

       -I regex
	      Include log entries which match the specified regular expression.  If neither -I nor -i is specified, all log entries are included.

       -i tag Include log entries with the specified tag.  If neither -I nor -i is specified, all log entries are included.

       -p period
	      Specifies the number of seconds to measure over, the default is 60 seconds. The first number in the list is the  average	number	of
	      requests seen over this time period.

       -n     Specifies the name of the varnishd instance to get logs from.  If -n is not specified, the host name is used.

       -r file
	      Read log entries from file instead of shared memory.

       -V     Display the version number and exit.

       -X regex
	      Exclude log entries which match the specified regular expression.

       -x tag Exclude log entries with the specified tag.

EXAMPLES

       The following example displays a continuously updated list of the most frequently requested URLs::

       varnishtop -i RxURL

       The following example displays a continuously updated list of the most commonly used user agents::

       varnishtop -i RxHeader -C -I ^User-Agent

SEE ALSO

       o varnishd(1)

       o varnishhist(1)

       o varnishlog(1)

       o varnishncsa(1)

       o varnishstat(1)

HISTORY

       The varnishtop utility was originally developed by Poul-Henning Kamp in cooperation with Verdens Gang AS and Varnish Software AS, and later
       substantially rewritten by Dag-Erling Smorgrav.	This manual page was written by Dag-Erling Smorgrav.

COPYRIGHT

       This document is licensed under the same licence as Varnish itself. See LICENCE for details.

       o Copyright (c) 2006 Verdens Gang AS

       o Copyright (c) 2006-2011 Varnish Software AS

AUTHOR

       Dag-Erling Smorgrav

1.0								    2010-05-31							     VARNISHTOP(1)
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