hi,
how would i extract a range of lines in a file by using the line number? ex: file contains:
1 title
2 i want
3 this part
4 to be taken out
5 from this file
6 and sent to
7 another file
8 not needed
9 end of file
In this case, i want to copy line number 2 to 7 on a new... (2 Replies)
Hello,
I have a very large text file with about 2 million lines.
Each of the lines starts like..
SNP_12345678 A 1212, 121, 343, ...
SNP_12345678 B 4567, 567, 454, ...
and so on.
I want to extract specific SNPs and plot them by GNUplot or excel.
The file is too large to be opened by text... (1 Reply)
Hi
I want to extract certain text between two line numbers like
23234234324 and
54446655567567
How do I do this with a simple sed or awk command?
Thank you.
---------- Post updated at 06:16 PM ---------- Previous update was at 05:55 PM ----------
found it:
sed -n '#1,#2p'... (1 Reply)
I regularly extract lines of text from files based on the presence of a particular keyword; I place the extracted lines into another text file. This takes about 2 hours to complete using the "sort" command then Kate's find & highlight facility.
I've been reading the forum & googling and can find... (4 Replies)
I would like to extract specific lines from a file and output them into another file.
Each line in the file has a unique ID, and I have a specific list of IDs (that are not consecutive) that I wish to extract.
for example:
1 aaaaaa bbbcb cccccc
2 aaaaaa bbbbb cccccd
3 aaaaaa bbbab... (6 Replies)
Hi,
I have a file which contains DDL statements- CREATE TABLE, CREATE INDEX, ALTER TABLE etc.
I have to only pick CREATE TABLE statements from the file-
Source :
----------------------------------------------
--DDL for table abc
--------------------------------------------
CREATE TABLE... (4 Replies)
Hi friends,
This is sed & awk type question.
I have a text file which has numbers spread all over the file. I want to sum the series of numbers whenever i find it and produce an output file with the sum. For example
###start of input text file ####
abc
def
ghi
1
2
3
4
kjld
random... (3 Replies)
Dear all,
Greetings.
I would like to ask for your help to extract lines with specific words in addition 2 lines before and after these lines by using awk or sed.
For example, the input file is:
1 ak1 abc1.0
1 ak2 abc1.0
1 ak3 abc1.0
1 ak4 abc1.0
1 ak5 abc1.1
1 ak6 abc1.1
1 ak7... (7 Replies)
Hi there,
I need a help with extracting data from tab delimited file which look like this
#CHROM POS ID REF ALT Human Cow Dog Mouse Lizard
chr2 3033 . G C 0/0 0/0 0/0 1/1 0/0
chr3 35040 . G T 0/0 0/0 ./. 1/1 0/1
chr4 60584 . T G 1/1 1/1 0/1 1/1 0/0
chr10 7147815 . G A 0/0 1/1 0/0 0/0... (9 Replies)
I have a folder containing text files. I need to extract specific lines from the files of this folder based on another file input.txt. How can I do this with awk/sed?
file1
ARG 81.9 8 81.9 0
LEU 27.1 9 27.1 0
PHE .0 10 .0 0
ASP 59.8 11 59.8 0
ASN 27.6 12 27.6 0
ALA .0 13 .0 0... (5 Replies)
Discussion started by: alanmathew84
5 Replies
LEARN ABOUT DEBIAN
devel::refcount
Devel::Refcount(3pm) User Contributed Perl Documentation Devel::Refcount(3pm)NAME
"Devel::Refcount" - obtain the REFCNT value of a referent
SYNOPSIS
use Devel::Refcount qw( refcount );
my $anon = [];
print "Anon ARRAY $anon has " . refcount($anon) . " reference
";
my $otherref = $anon;
print "Anon ARRAY $anon now has " . refcount($anon) . " references
";
DESCRIPTION
This module provides a single function which obtains the reference count of the object being pointed to by the passed reference value.
FUNCTIONS
$count = refcount($ref)
Returns the reference count of the object being pointed to by $ref.
COMPARISON WITH SvREFCNT
This function differs from "Devel::Peek::SvREFCNT" in that SvREFCNT() gives the reference count of the SV object itself that it is passed,
whereas refcount() gives the count of the object being pointed to. This allows it to give the count of any referent (i.e. ARRAY, HASH,
CODE, GLOB and Regexp types) as well.
Consider the following example program:
use Devel::Peek qw( SvREFCNT );
use Devel::Refcount qw( refcount );
sub printcount
{
my $name = shift;
printf "%30s has SvREFCNT=%d, refcount=%d
",
$name, SvREFCNT($_[0]), refcount($_[0]);
}
my $var = [];
printcount 'Initially, $var', $var;
my $othervar = $var;
printcount 'Before CODE ref, $var', $var;
printcount '$othervar', $othervar;
my $code = sub { undef $var };
printcount 'After CODE ref, $var', $var;
printcount '$othervar', $othervar;
This produces the output
Initially, $var has SvREFCNT=1, refcount=1
Before CODE ref, $var has SvREFCNT=1, refcount=2
$othervar has SvREFCNT=1, refcount=2
After CODE ref, $var has SvREFCNT=2, refcount=2
$othervar has SvREFCNT=1, refcount=2
Here, we see that SvREFCNT() counts the number of references to the SV object passed in as the scalar value - the $var or $othervar
respectively, whereas refcount() counts the number of reference values that point to the referent object - the anonymous ARRAY in this
case.
Before the CODE reference is constructed, both $var and $othervar have SvREFCNT() of 1, as they exist only in the current lexical pad. The
anonymous ARRAY has a refcount() of 2, because both $var and $othervar store a reference to it.
After the CODE reference is constructed, the $var variable now has an SvREFCNT() of 2, because it also appears in the lexical pad for the
new anonymous CODE block.
PURE-PERL FALLBACK
An XS implementation of this function is provided, and is used by default. If the XS library cannot be loaded, a fallback implementation in
pure perl using the "B" module is used instead. This will behave identically, but is much slower.
Rate pp xs
pp 225985/s -- -66%
xs 669570/s 196% --
SEE ALSO
o Test::Refcount - assert reference counts on objects
AUTHOR
Paul Evans <leonerd@leonerd.org.uk>
perl v5.14.2 2011-11-15 Devel::Refcount(3pm)