Hi everyone,
This is my first post, but I have already received a lot of help from the forums in the past. Thanks!
I've searched the forums and my question is very similar to an earlier post entitled "Printing highest value from one column", which I am apparently not yet allowed to post a... (1 Reply)
Hi everyone,
This is my first post, but I have already received a lot of help from the forums in the past. Thanks!
I've searched the forums and my question is very similar to an earlier post entitled "Printing highest value from one column", which I am apparently not yet allowed to post a... (3 Replies)
Hello everyone,
I am writing a script to process data from the ATP world tour.
I have a file which contains:
t=540 y=2011 r=1 p=N409
t=540 y=2011 r=2 p=N409
t=540 y=2011 r=3 p=N409
t=540 y=2011 r=4 p=N409
t=520 y=2011 r=1 p=N409
t=520 y=2011 r=2 p=N409
t=520 y=2011 r=3 p=N409
The... (4 Replies)
Just want to say this is great resources for all thing Unix!!
cat tmp.txt
A 3
C 19
A 2
B 5
A 1
A 0
C 13
B 9
C 1
Desired output:
A 3
B 9
C 19
The following work but I am wondering if there is a better way to do it: (4 Replies)
There are some duplicate field on description column .I want to print duplicate row along with highest version of number and corresponding description column.
file1.txt
number Description
=== ============
34567 nl21a00is-centerdb001:ncdbareq:Error in loading init
34577 ... (7 Replies)
How to print the names with a highest value within a set and filter if it is the only unique group within the same set
input
sets names value groups
j007 shot1 0.6 a
j007 shot2 0.5 b
j007 shot3 0.4 bb
j007 shot4 0.3 bc
j007 shot5 0.2 ... (8 Replies)
Hi, I have a little issue right now.
I have a file with 4 columns
test0000002,10030010330,c_,218
test0000002,10030010330,d_,202
test0000002,10030010330,b_,193
test0000002,10030010020,c_,178
test0000002,10030010020,b_,170
test0000002,10030010330,a_,166
test0000002,10030010020,a_,151... (2 Replies)
Hi, I have a little issue right now.
I have a file with 4 columns
test0000002,10030010330,c_,218
test0000002,10030010330,d_,202
test0000002,10030010330,b_,193
test0000002,10030010020,c_,178
test0000002,10030010020,b_,170
test0000002,10030010330,a_,166
test0000002,10030010020,a_,151... (3 Replies)
grepping on a value but then want to print only those lines that have the highest value in the 4th column
log text text R59FJ
log text text R63FT
log text text R60JX
log1 text text R63EA
log1 text text R60JX desired output
log text text R63FT
log1 text text R63EAtried this but not getting... (2 Replies)
Discussion started by: jimmyf
2 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)