I have a data of the form
0.0117843924 0. 0. 0. 0.
0.011036017 0. 0. 0. 0.
0.0103351669 0. 0. 0. 0.
4839.41211 0. 0. 0. 0.
4532.08203 0. 0. 0. 0.
I would like to insert a couple of blank lines before the 4839 line, every time it appears. The numbers in the... (2 Replies)
Hi,
I wish to format the output of a grep command in such a way that sed will be able to handle the newline characters held in the output.
Since sed does not allow newlines to be contained in a replacement pattern, that means adding a backslash '\' character to the end of each line from... (8 Replies)
Hi,
I am a newbie to shell scripting and to Linux environment as well.
In my project I am trying to search for following text from the httpd.conf file
<Directory '/somedir/someinnerdir'>
AllowOverride All
</Directory>
and then remove this text and again rewrite the same text.
The... (1 Reply)
Hi,
I have a file of the following from:
Afghanistan
gdpcapit|800
Akrotiri
Albania
gdpcapit|6000
now I want have the gdpcapit value next to the country when there is one like this:
Afghanistan 800
gdpcapit|800
Akrotiri
Albania 6000
gdpcapit|6000
How do I do this? I've... (4 Replies)
Hey everyone, I'm new to sed and I need to create a script for inserting one line of code at the beginning of every method in a Xcode project (over 6,000 methods). Each method Structure is
(+ or -) (Various declarations-- could span multiple lines) ({)
I've tried for days, any guidance would be... (2 Replies)
Experts,
I am novice unix user. At my work, most of our DBA's work on creating DDL's to create new tables in production. At every week we need to validate the scripts (do peer review) and it takes a while and also it is not effective when we have like 150 tables created in the scripts. I am... (3 Replies)
As per my requirement, I need to get a multiline input. It can be stored in a file, that's not a problem. User will be prompted to enter steps. he should able to enter the steps in multiple lines by pressing enter.
All I know in read command that reads the input till we press enter. Can someone... (5 Replies)
Hi guys,
I am fairly comfortable with using the sed command if the string to be replaced is all on a single line.
I was wondering is it possible to use sed command in a multiline way ?
Say for example I have the below string on 2 different lines:
{
"key": "brandNameA",
... (3 Replies)
I have a file conatining the below:
---
10.9.16.116:
/tmp/5835113081224811756.jar:
hash: e6df90d38fa86f0e289f73d79cd2cfd2a29954eb
/tmp/4603745991442278706.jar:
hash: e6df90d38fa86f0e289f73d79cd2cfd2a29954eb
10.9.14.126:
/tmp/conf/extra/httpd-ssl.conf:
hash:... (1 Reply)
Discussion started by: mohtashims
1 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)