How can I write a script to submit a perl script as a cron job but only have it execute once?
After it has executed once, I would like it to automatically insert itself again into cron.
I want to avoid the situation where I schedule a cron job to run once a day, but end up with multiple... (4 Replies)
Hi all,
I am currently facing a problem when i am submitting a script to run in the background to collect statistics round the clock on an AIX box. I don't have root authority nor can I set it in cron.
So when i submit the job, it runs fine, but won't let me signoff. It prompts me that... (2 Replies)
Discussion started by: tansha
2 Replies
3. Forum Support Area for Unregistered Users & Account Problems
hello admins,
i dont use unix.com very often - but when i do have questions, i submit them at the site - but now I cannot submit anything in any forum on the site. The is the only forum i could add a new thread.
its tells me that my account could be de-righted, or that im tring to submit... (1 Reply)
Hi,
I have a custom HTML form that has a couple radio buttons and a text field that requires a number.
I'm not a php programmer and could use some help with putting together php code to calculate a total based on the radio button selection and the text field number.
... (3 Replies)
Hello sir,
I worked out some features using java,shell programming and modified the bash shell. We have come up with 13 new features.
I want to know where should I submit my work so that it would be of some use to the open source professionals :confused: (1 Reply)
I'm trying to upload a file to a page using curl and after uploading that file i want to store the redirecting page so i can download the results.
I'm using the command:
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Discussion started by: limadario
8 Replies
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hello
my script is submitting POST-data to a site
(its not my first script, i've done these before many times (include parsing scripts) but this one is tough)
so the problem is i'm submitting a form with firefox
and in firebug i see WHAT exactly i'm submitting
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when i do EXACTLY the... (28 Replies)
Hi,
I'm trying to edit my working bash script to an SGE script in order to submit it as a job to the cluster.
Currently I have:
#!/bin/bash
# Perform fastqc on files in a specified directory.
for ((j=1; j <=17; j++))
do
directory=/data4/una/batch"$j"/
... (0 Replies)
Discussion started by: una1992
0 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)