Alrigt, I need to write a shell script where it counts the number of folders and files and dispays "My home directory has 'x' files and 'y' directories."
So, I was thinking of doing this.
set x = `ls | wc`
so, if I have 8 files and folders in my home directory, x is not 8.
now, I was... (1 Reply)
Anyone know where I can get started in C++ programming in unix?
Any good free tutorials or websites to start at?
I am okay in unix scripting but have never done c programming of any sort...
What are the main advantages of using C++ ? (2 Replies)
Hi, I'm in dire need of some help for AWK. I'm a college student and my statistics professor decided he'd teach AWK in the last two days of our class, even when it's not programming class and we don't even have computers in class to experiment. Anyway, I tried looking at AWK tutorials, but it... (4 Replies)
hi guys,
i have a DEl xps laptop cor 2 duo 2.2
i have vista installed on it
i want to install a dual Boot UNIX on it..
can some one guide me ...cause i m tottaly new to UNIX
i want to install unix on that laptop along with Vista....
thx
any help would be deeply appreciated
(sorry if i... (5 Replies)
I need to write a script to test a nsort c program. I have written 8 .txt files with different cases. Also 8 .txt files with expected outcome. The shell I have written always "test pass" for the first case but always "fail" for the rest... Here is a portion of my code (as I still don't know how to... (5 Replies)
Hi people....
I have just started to learn unix.I want to know which version of Unix to install plus how to install it.I need to practise and make myself aware of how unix works.My thread is from an educational point of view.Also please feel free to give your suggestions as I am... (3 Replies)
Hello,
I am trying to write a script that reads names from a file called input, removes names if they have the same letter next to each other and prints the others.
e.g. Colin & John would be printed
Garry & Lynn would be removed
My thinking is that I read in each name and... (3 Replies)
Hi All,
I have just now started learning awk from the source - Awk - A Tutorial and Introduction - by Bruce Barnett
and the bad part is that I am stuck on the very first example for running the awk script.
The script is as -
#!/bin/sh
# Linux users have to change $8 to $9
awk '
BEGIN ... (6 Replies)
I am going to learn AWK for Pattern search (extracting strings ) related activities. I think that is what AWK is used for anyway.
What book/similair resource would you suggest for a beginner ? (4 Replies)
i have windows 8 host on Dell Laptop
vmware 9
redhat 7.2 iso downloaded through redhat official site
after installation on vm it only boots into text dont show graphics
Please guide:( (1 Reply)
Discussion started by: hananabbas
1 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)