i can only find the first occurance of a pattern how do i set it to loop untill all occurances have changed.
#! /usr/bin/perl
use POSIX;
open (DFH_FILE, "./dfh") or die "Can not read file ($!)";
foreach (<DFH_FILE>) {
if ($_ !~ /^#|^$/) {
chomp;
... (1 Reply)
hi i am trying to get digits inside brackes from file , whose structure is defined below
CREATE TABLE TELM
(SOC_NO CHAR (3) NOT NULL,
TXN_AMOUNT NUMBER (17,3)
SIGN_ON_TIME CHAR (8)
TELLER_APP_LIMIT NUMBER (17,3)
FIL01 ... (2 Replies)
Hello
I got the below one from in one of this forums
For Ex: Loading File System Networking in nature
now i need to extract the patterns between the words File and Networking :
i.e. sample output: System
cmd used : cat <file> | sed 's/.*File //' | sed 's/Closing.*$//'
Actually... (0 Replies)
Hi,
I got doubt in Pattern matching, could you tell me how the following differs in action ??
if ( $line1==/$line2/ )
if ( $line1=~/$line2/ )
if ( $line1=~m/$line2/)
What is the significance of '~' in matching.
Thanks in advance
CoolBhai (5 Replies)
Hello experts,
I have a file containing the following text(shortened here).
File Begin
----------
< # Billboard.d3fc1302a677.imagePath=S:\\efcm_T4
< Billboard.d3fc1302a677.imagePath=S:\\efcm_T4
---
> # Billboard.d3fc1302a677.imagePath=S:\\efcm_Cassini
>... (2 Replies)
Hi experts,
I have many occurances of the following headers in a file. I need to grep for the word changed/inserted in the header, calculate the difference between the two numbers and list the count incrementally.
Headers in a file look like this:
-------------------
---------------------... (6 Replies)
I am doing a file patterhn matching for a text file in PERL
I am using this,,, but it says that no file is found
$filepattern = '\d{1,4}.*A0NW9693.NDM.HBIDT.*.AD34XADJ.txt';
Can anyone help me out with Perl Pattern Matching concepts and how to do pattern matching for this txt file:... (4 Replies)
I have a 2 files in .gz format and it consists of 5 million lines the format of the file would be
gzcat file1.gz | more
abcde
aerere
ffgh56
..
..
12345
gzcat file2.gz | more
abcde , 12345 , 67890,
ffgh56 , 45623 ,12334
whatever the string is in the file1 should be matched... (3 Replies)
My log file looks as given below, its actually a huge file around 1 GB and these are some of the line:
conn=5368758 op=10628050 msgId=64 - RESULT err=0 tag=101 nentries=1 etime=0
conn=7462122 op=-1 msgId=-1 - fd=247 slot=247 LDAPS connection from 10.13.18.12:37645 to 10.18.6.45
conn=7462122... (5 Replies)
I am using Perl version 5.8.4 and trying to understand the use of regular expression. Following is my code and output.
$string = "Perl is a\nScripting language";
($start) = ($string =~ /\A(.*?) /);
@lines = ($string =~ /^(.*?) /gm);
print "First Word (using \\A): $start\n","Line... (4 Replies)
Discussion started by: jnrohit2k
4 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)