Note that piping the output from tail like that can cause it to be treated in blocks, so the output may not be quite as real-time as you'd like, but try it and see.
Hi,
I am trying to write a script which would go search and get the info from the logs based on yesterday timestamp and write yesterday logs in new file. The log file format is as follows:
""""""""""""""""""""""""""... (3 Replies)
I want to find the unique url in a apache logs which got 404 error .
I can do something like
"cat apache.log|grep 404|awk '{print $2,$3}'|grep 404
this will give me say
/foo.html 404
/foo.html 404
/foo.html 404
/bar.html 404
/cat.html 404
However my output should only find... (3 Replies)
Hi,
could anyone help me out how to write a script, to grep the two timestamp from a particular file, so that it will list out all the logs between the particular timestamp
I have a pattern of log:
servicename operationname starttime endtime
eg.,
servicename1 operationname1 01:11:11... (1 Reply)
I have prepare script to grep for outofmemory messages in the logs. I need help in modifying script. I have implemented small logic. The outofmemory messages form six logs will store in variables.
var1=`grep -i outofmemory $tomcat1logs | sed -n '$p'| sed -n -e "s/.*\(outofmemory\).*/\1/p"`... (6 Replies)
I have requirement to prepare script which will grep for latest outofmemory message from the logs. I have used following command to grep the string from the logs,this script is not effective when logs are not getting updated as it will grep for old message.
f=catalina.out
var=`tail -10 $f |... (17 Replies)
Hello all. I am new to this forum and also very new to using grep - so please excuse me if this question is not in the correct forum and/or is not pertinent to this website.
I use greps like this:
gunzip -c L:\System1\SailLogger_20071019* L:\System2\SailLogger_20071019*... (14 Replies)
Hi Guys,
I want to write a script which can grep the logs (server.log) from a file for Error String and output to a other file.
Problems:
How to know about the errors only between the current restart and not in previous as server.log has earlier restarts also?
thanks for the help! Much... (5 Replies)
Hello,
I need to write one script which should search particular pattern like ABCD in log file name hello.txt only in current date logs.
in current directory i have so many past date logs but grep should be applied on current date logs.
on daily basis current date logs are in number 30 and... (2 Replies)
I'm in need of some kind of script that will search for a string in each logfile in a directory but we don't want to use GREP. GREP seems to use up to much of our memory causing the server to use up a lot of swap space. Our log files are bigger than 500M on a daily basis. We lately started... (8 Replies)
Hi,
system date format
Thu Jun 13 12:55:18 EDT 2019
My log date format
09.148.192.60 - - "GET /akamai/sureroute-test-object.html HTTP/1.1" 404 231
can someone please help me, how to get last 5mins of logs please ? I need the command
Please wrap your samples/codes in CODE TAGS,... (3 Replies)
Discussion started by: scazed
3 Replies
LEARN ABOUT DEBIAN
poe::filter::grep
POE::Filter::Grep(3pm) User Contributed Perl Documentation POE::Filter::Grep(3pm)NAME
POE::Filter::Grep - select or remove items based on simple rules
SYNOPSIS
#!perl
use POE qw(
Wheel::FollowTail
Filter::Line Filter::Grep Filter::Stackable
);
POE::Session->create(
inline_states => {
_start => sub {
my $parse_input_as_lines = POE::Filter::Line->new();
my $select_sudo_log_lines = POE::Filter::Grep->new(
Put => sub { 1 },
Get => sub {
my $input = shift;
return $input =~ /sudo[d+]/i;
},
);
my $filter_stack = POE::Filter::Stackable->new(
Filters => [
$parse_input_as_lines, # first on get, last on put
$select_sudo_log_lines, # first on put, last on get
]
);
$_[HEAP]{tailor} = POE::Wheel::FollowTail->new(
Filename => "/var/log/system.log",
InputEvent => "got_log_line",
Filter => $filter_stack,
);
},
got_log_line => sub {
print "Log: $_[ARG0]
";
}
}
);
POE::Kernel->run();
exit;
DESCRIPTION
POE::Filter::Grep selects or removes items based on simple tests. It may be used to filter input, output, or both. This filter is named
and modeled after Perl's built-in grep() function.
POE::Filter::Grep is designed to be combined with other filters through POE::Filter::Stackable. In the "SYNOPSIS" example, a filter stack
is created to parse logs as lines and remove all entries that don't pertain to a sudo process. (Or if your glass is half full, the stack
only selects entries that DO mention sudo.)
PUBLIC FILTER METHODS
In addition to the usual POE::Filter methods, POE::Filter::Grep also supports the following.
new
new() constructs a new POE::Filter::Grep object. It must either be called with a single Code parameter, or both a Put and a Get parameter.
The values for Code, Put, and Get are code references that, when invoked, return true to select an item or false to reject it. A Code
function will be used for both input and output, while Get and Put functions allow input and output to be filtered in different ways. The
item in question will be passed as the function's sole parameter.
sub reject_bidoofs {
my $pokemon = shift;
return 1 if $pokemon ne "bidoof";
return;
}
my $gotta_catch_nearly_all = POE::Filter::Grep->new(
Code => &reject_bidoofs,
);
Enforce read-only behavior:
my $read_only = POE::Filter::Grep->new(
Get => sub { 1 },
Put => sub { 0 },
);
modify
modify() changes a POE::Filter::Grep object's behavior at run-time. It accepts the same parameters as new(), and it replaces the existing
tests with new ones.
# Don't give away our Dialgas.
$gotta_catch_nearly_all->modify(
Get => sub { 1 },
Put => sub { return shift() ne "dialga" },
);
SEE ALSO
POE::Filter for more information about filters in general.
POE::Filter::Stackable for more details on stacking filters.
BUGS
None known.
AUTHORS & COPYRIGHTS
The Grep filter was contributed by Dieter Pearcey. Documentation is provided by Rocco Caputo.
Please see the POE manpage for more information about authors and contributors.
perl v5.14.2 2012-05-15 POE::Filter::Grep(3pm)