Hi all,
How can I quickly show Nth line from the huge file(at least more than 15GB)? I used the following script but seems slower.
See 2717298 th line.
head -2717298 data0802.dat | tail -1
Thank you very much (4 Replies)
i'm a beginner in shell and i have a txt file that is updating every second or msec so i need a program to read the last line of this txt file
is this possible to do? (5 Replies)
Hi,
I have a .txt file which contains the x, y and z co-ordinates of particles which I am trying to cast for a particular compound. The no. of particles present is of the order of 2 billion and hence the size of the text file is of the order of a few Gigabytes. The particles have been casted layer... (5 Replies)
In a txt file called, eso.txt, I have:
......
3 where process_status_flag = 70 and LISTENER_ID in (930.00, 931.00, 932.00, 933.00, 934.00)
4 group by LISTENER_ID
5 order by LISTENER_ID;
LISTENER COUNT
----------... (3 Replies)
So I have a python program that I run, which runs accordingly to options I have listed in a text file (ie user_prefs). Now there are many options listed in this user_prefs.txt, but the one of most interest to me is that of the file path of the time series.
I have over a hundred of these time... (8 Replies)
I want to add/append the info in the following format to my.txt file.
20130702|abcd20130702.txt FN|SN|DOB
I tried the below script but it throws me some exceptions.
<#!/bin/sh
dt = date '+%y%m%d'members;
echo $dt+|+members+$dt;
/usr/bin/awk -f
BEGIN { FS="|"; OFS="|"; } { print... (6 Replies)
Hi,
i have a scenario were i should compare a few fields from each line then increment a variable based on that.
Example file
989878|8999|Y|0|Y|N|V
989878|8999|Y|0|N|N|V
989878|8999|Y|2344|Y|N|V
i have 3 conditions to check and increment a variable on every line
condition 1 if ( $3... (4 Replies)
Hello All,
I have file a.txt
I want to add a counter loop at the end of each line in a file
ill explain:
i have a site h**p://test.test=Elite#1
i want to add a a counter to the number at the end of the file, that it will be like this
urlLink//test.test=Elite#1
urlLink//test.test=Elite#2... (3 Replies)
Hi All
Is there a way to export every line into new txt file where by the title of each txt output are same as the line ?
I have this txt files containing names:
Kandra Vanhooser
Rhona Menefee
Reynaldo Hutt
Houston Rafferty
Charmaine Lord
Albertine Poucher
Juana Maes
Mitch Lobel... (2 Replies)
Hi
I have problem with replace line in txt file , I have this string:
144185 DISK
Piece qqr8ot6l_1_1
--
144186 DISK
Piece ukr8pf2e_1_1
--
144187 DISK
Piece ter8p9gc_1_1
--
144188 DISK
Piece 4er8qb84_1_1
and (8 Replies)
Discussion started by: primo102
8 Replies
LEARN ABOUT DEBIAN
file::counterfile
CounterFile(3pm) User Contributed Perl Documentation CounterFile(3pm)NAME
File::CounterFile - Persistent counter class
SYNOPSIS
use File::CounterFile;
$c = File::CounterFile->new("COUNTER", "aa00");
$id = $c->inc;
open(F, ">F$id");
DESCRIPTION
This module implements a persistent counter class. Each counter is represented by a separate file in the file system. File locking is
applied, so multiple processes can attempt to access a counter simultaneously without risk of counter destruction.
You give the file name as the first parameter to the object constructor ("new"). The file is created if it does not exist.
If the file name does not start with "/" or ".", then it is interpreted as a file relative to $File::CounterFile::DEFAULT_DIR. The default
value for this variable is initialized from the environment variable "TMPDIR", or /usr/tmp if no environment variable is defined. You may
want to assign a different value to this variable before creating counters.
If you pass a second parameter to the constructor, it sets the initial value for a new counter. This parameter only takes effect when the
file is created (i.e. it does not exist before the call).
When you call the "inc()" method, you increment the counter value by one. When you call "dec()", the counter value is decremented. In both
cases the new value is returned. The "dec()" method only works for numerical counters (digits only).
You can peek at the value of the counter (without incrementing it) by using the "value()" method.
The counter can be locked and unlocked with the "lock()" and "unlock()" methods. Incrementing and value retrieval are faster when the
counter is locked, because we do not have to update the counter file all the time. You can query whether the counter is locked with the
"locked()" method.
There is also an operator overloading interface to the File::CounterFile object. This means that you can use the "++" operator for
incrementing and the "--" operator for decrementing the counter, and you can interpolate counters directly into strings.
COPYRIGHT
Copyright (c) 1995-1998,2002,2003 Gisle Aas. All rights reserved.
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
AUTHOR
Gisle Aas <gisle@aas.no>
perl v5.10.0 2004-01-23 CounterFile(3pm)