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1. UNIX for Beginners Questions & Answers
I am having trouble matching *two* strings from one file anywhere in a line of a second file, and could use some help getting this figured out. My preference would be to use grep for this because I would like to take advantage of its -A option. The latter is due to the fact that I would like both... (2 Replies)
Discussion started by: jvoot
2 Replies
2. UNIX for Beginners Questions & Answers
I cannot seem to get what should be a simple awk one-liner to work correctly and cannot figure out why. I would like to use patterns from a specific field in one file as regex to search for matching strings in the entire line ($0) of another file.
I would like to output the lines of File2 which... (1 Reply)
Discussion started by: jvoot
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3. Shell Programming and Scripting
Hi, I have multiple files on a directory with the following content:
blahblah
blahblah
hostname server1
blahblah
blahblah
---BEGIN---
aaa
bbb
ccc
ddd
---END---
blahblah
blahblah
blahblah
I would like to filter all the files with awk or sed or something else so I can get below... (6 Replies)
Discussion started by: bayupw
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4. Shell Programming and Scripting
Hi,
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2214.94 Safari/537.36
How can I grep for the strings chrome and safari from a file, and if chrome print Chrome/40.0.2214.94 to a file and also count the number of times chrome is found?
... (4 Replies)
Discussion started by: cyberfrog
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5. UNIX for Dummies Questions & Answers
Hello,
Here I have some grep command which is not working correctly:
cat file1.txt:
apples
Date: Sun, 24 Feb 2013 8:14:06 -0800
peaches melons
cherry sky cloud
green purple
yellow
cat file2.txt:
apples
Date
peaches melons 0800
cherry sky cloud
green purple
black (2 Replies)
Discussion started by: holyearth
2 Replies
6. Shell Programming and Scripting
I have a script that periodically checks the Apache error_log to search for a specific error that causes it to hand and, if found, it restarts the service.
I recently found another error that forces it to hand and won't serve pages until it is reset. What I'm trying to do is to get the script to... (3 Replies)
Discussion started by: cfjohnsn
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7. Shell Programming and Scripting
i have a file like below
ABS 12234 A C 12G
CFY 23865 A C 34D
i want to grep "A C" then print
ABS 12G 12234
CFY 34D 23865
Thanks! (4 Replies)
Discussion started by: kingpeejay
4 Replies
8. Shell Programming and Scripting
Hello All,
I have a big file about 1000 lines. Now i am trying to grep a particular string and printing the lines from the string.
say for example in 500th line i have the date as "Mon Wed 14 20:15:24 2010". now i in my case i need to grep the combination of the strings "Mon Wed 14" and the... (7 Replies)
Discussion started by: intiraju
7 Replies
9. Shell Programming and Scripting
Hi,
Can any one pelase tell me how to grep multiple strings from multiple files in a singel folder?
grep -E "string1|string2|string3|string4|string..."
its taking lots of time..
can any please tell me fast grep???
URGENT (10 Replies)
Discussion started by: durgaprasad
10 Replies
10. Shell Programming and Scripting
Hai,
Just want to print only alphanumeric in a file
ex:-
fdsdsklf#@^%$#hf
output:- fdsdsklfhf
plz, help me:o (5 Replies)
Discussion started by: balan_mca
5 Replies
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)