Hi,
I tried to search, but could not find answer for this really:
Is it possible to create a user that would have access only to a defined list of files? I would like to create a user that can access a set of files that are located behind different path. This user should not have access to... (1 Reply)
dear guys,
sorry for asking a noob :p question, tried to search the forum for an answer but couldn't find one, i am running solaris 10 and i would like to create a user with limited access to view only one directory, the directory already exist, is this possible:confused:?
thanks and regards (4 Replies)
Hi,
I have an UNIX script which runs in every 20 mins of all the days scheduled through CRON.
But i need to modify the CRON entry such that it should run from 00:00 AM to 18:00 and again from 22:00 to 23:59 on Saturday. Remaning days, it should run as usual in every 20 mins.
Could... (1 Reply)
Hi,
I have an UNIX script which runs in every 20 mins of all the days scheduled through CRON.
But i need to modify the CRON entry such that it should run from 00:00 AM to 18:00 and again from 22:30 to 23:59 on Saturday. Remaning days, it should run as usual in every 20 mins.
Could anybody... (1 Reply)
Hi
Im trying to extract a specific pattern of data from a log file and store it in a other file, Im executing the below command in various files and storing it in a single file. I data that Im storing needs to be arranged based on a date and timestamp. Please assist, how to achieve this. Thanks... (1 Reply)
Hi,
I want to create a user using useradd -m test. But my requirement is he should not change his directory from Home directory.
How can I restric the user not to change his directory from his home dir?
Thanks,
Suresh
Double Post (0 Replies)
Hi,
If there are 20 files in current directory ,How display the long listing of files in that directory with listing of four files at once.. (3 Replies)
Hi,
I have log file which rolls out every second which is as this.
HttpGenRequest - -<!--OXi dbPublish--> <created="2014-03-24 23:45:37" lastMsgId="" requestTime="0.0333"> <response request="getOutcomeDetails" code="114" message="Request found no matching data" debug="" provider="undefined"/>... (3 Replies)
Hi,
I am using following command:
tcpdump -i eth1 icmp =8 >output.txt
i want this command to get execute for a minute only. How can we do this?
Thanks.
Please use code tags next time for your code and data. Thanks (2 Replies)
Discussion started by: Satyajeet@uh
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)