Dear All
I am curious to know, that in a system compromise, when someone has access to a box, does that individual have access to a shell on the system, i.e. the person is logging into the system using telnet or SSH to remotely access the box?? How does this individual/ hacker access the system. ... (2 Replies)
I have a website but I do not for the life of me know how to upload using unix based command lines. Can someone send me a good site that has these commands. That and I am curious to know more about command line based interfacing. :D Curious Dummy (1 Reply)
To correct most of the problems with this language, How do I remove the DOS and WORD stuff from it? These come from the fact that it was written on those with a Microsoft supplied platform at the writers request. (1 Reply)
Hi,
I am seeing a curious issue with 'ls' command.
If I open a telnet session of my Solaris box and give "ls".
The output is in 3 columns.
a b c
d e f
g h i
j k l
However, if I give the same command after a couple of hours in the same window, it goes to 6 columns according to the... (7 Replies)
sorry, just simple question:
how can i do this in bash>
foreach i( 1 2 3 )
sed 's/Hello/Howdy/g' test$i > test$i.new
mv test$i.new test$i
end (6 Replies)
Hello folks,
I have a newly installed Solaris 10 system running on a T6320 blade. I have set up LDM with the intent to move an ldom from another blade to this one. So far, so good.
I had the SAN folks make the LUNs belonging to the ldom visible to my new blade and I can see them, all 4 paths.... (4 Replies)
I was talking to a coworker and we got into a discussion about the -9. No one knew where the -9 came from and it's not in the man. I suggested that it was like counting to 10 (0-9) and you finally get to the point that that's it, the durned thing is going to die. So how did the -9 come to mean... (3 Replies)
I dont get something about sed
If i have a text file inside contain a:a:a:a:a
sed "s/"$title:$author:$price:$qtyAvailable:$qtySold"/"$Ntitle:$author:$price:$qtyAvailable:$qtySold"/"
This work!!
but
If i have a text file inside contain Tom Tom:La La:Di Di :Do Do :De DE
It cannot work... (2 Replies)
Discussion started by: GQiang
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)