11-23-2006
Is NULL an empty field or an actual NULL?
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1. Shell Programming and Scripting
hi,
How can I check for a field in a pipe-delimited file having a NULL value in Unix using a grep command or any other command.
Please reply (5 Replies)
Discussion started by: sureshg_sampat
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2. HP-UX
Hello,
Below is my input file's content ( in HP-UX platform ):
ABCD120672-B21 1
ABCD142257-002 1
ABCD142257-003 1
ABCD142257-006 1
From the above, I just want to get the field of 13 characters that comes after 'ABCD' i.e '120672-B21'... . Could... (2 Replies)
Discussion started by: jansat
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3. UNIX for Dummies Questions & Answers
the file has several date fields.for example, #2, #3,and #5 are date fields.
I want grep year '2002' just within #2 field and get all the rows which content year '2002' in the #2 field. is it possible to do this? how to do it? Thanks (2 Replies)
Discussion started by: tiff-matt
2 Replies
4. Shell Programming and Scripting
Dear All,
I have the following input file. I want to replace data with null values.
I/P File:
9022334455|2008-12-06 06:10:21|2|Error@@@|esoo8erp|
9024334432|2008-12-06 08:40:59|6|Error@@@|6y2o8e6r|
O/P File:
9022334455||2||esoo8erp|
9024334432||6||6y2o8e6r|
... (4 Replies)
Discussion started by: hanu_oracle
4 Replies
5. Shell Programming and Scripting
Hi,
I know there are lots of threads on replacing text within files, usually using sed or awk. However, I find it hard to adapt examples that I found to my specific case. I am kind of new to UNIX and have hard times learning the syntax either for sed or awk so I would appreciate any help. Here's... (5 Replies)
Discussion started by: vytenis
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6. Shell Programming and Scripting
hi,
I would like to search for a specific string at a specific line in a file and would like to know the count of it.
eg: samp.txt
ABC 1234 BELL
HNZ 4567 RING
NNN 5673 BELL
Please help with the command to find the count of BELL in the above file samp.txt at the specific line 10 with... (7 Replies)
Discussion started by: techmoris
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7. Shell Programming and Scripting
Hi,
I've a pipe delimited file and wanted to replace the 3rd field to 099990 where the values are null. How can I achieve it using awk or sed.
20130516|00000061|02210|111554|03710|2|205069|SM APPL $80-100 RTL|S
20130516|00000061|02210|111554|03710|2|205069|SM APPL $80-100 RTL|S... (12 Replies)
Discussion started by: rudoraj
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8. UNIX for Dummies Questions & Answers
This could be a really dummy question.
I have a log text file.
What unix command to extract line from specific string to another specific string.
Is it something similar to?:
more +/"string" file_name
Thanks (4 Replies)
Discussion started by: aku
4 Replies
9. Shell Programming and Scripting
Hi Folks,
We have a file that has null values but there are no delimiters. So all columns are considered as a single column.
Ex:
abc def 123
abcdef1234567
hijklmn7896545
Now from "a" till "3" all are considered as a single column from the first row.
Our requirement is like, we... (2 Replies)
Discussion started by: jayadanabalan
2 Replies
10. Shell Programming and Scripting
I am trying to add a tab after the last digit in $3 in the input. The grep below is all I can think off. Thank you :)
sed -n 's/:/&/p' input
input
chr1 955542 955763AGRN-6|gc=75
chr1 957570 957852AGRN-7|gc=61.2
chr1 976034 976270AGRN-9|gc=74.5
desired output
chr1... (5 Replies)
Discussion started by: cmccabe
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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)