I've searched the forum and google, but can't see an answer to this simple problem. Here's my small test script:
#!/bin/csh
echo "enter a number:"
read num
echo "you entered $num"
set num = `expr $num + 1`
echo new value is $num
can someone show me how to do this calculation? note that... (4 Replies)
hello, I must've screwed something here..
I just had hdisk0 replaced by IBM.. now it shows up as hdisk2 instead.
Before doing that, I've had it split from hdisk1, and reduced from rootvg.
Just did a rmdev -dl hdisk2.. ran cfgmgr, but still shows up as hdisk2 instead of hdisk0.. help! (2 Replies)
Hi All,
To avoid race condition, instead of using mutex, semaphore, spinlock etc.... Is there any other mechanism by which we can avoid race condition in an multi-threading environment.
-Thanks (6 Replies)
I have a log file that display the serial output coming from different places. Sometime the string in search gets clobbered with the other strings and consequently change form. For example:
serial ouput:
--------------
hello world!
done with network
configuring asic registers
comJan 1... (2 Replies)
Source data:
"123","aaa bbb CCC","12000"
"134","HHH,bbc","13000"
i have a delimited file. i want to replace with the pipe.The sed command is not working for replacing a delimeter.
Command :
sed s/\,/\|/g filename
Output : When i run the command it is replacing the columns value... (7 Replies)
Hi experts,
As i am a novice unix player...so need help for the below query...banged my head from quite a while...:confused:
i have a set of html files, in which i need to search for string "Page"(case sensitive) and then replace the same with some numeric code ,say, "XXX1234".
Here in... (2 Replies)
Hi,
I am trying to generate list of employees from emp table who joined yesterday.
emp.sh
YEST=$(date --date='1 day ago' +%Y-%m-%d)
cat emp.sql | mysql -u <user> -p<pass> -h <host> -P <port> -D <dbname> > emp.csv
emp.sql
select * from employee where join_date = '$YEST';
I expected... (3 Replies)
My task is to copy all files from many directories in one. The big problem i encounter is that some files in different directory have the same names. Is they are way to copy the files that have same names in a sub directory ( need to preserve the name of the files unchanged )
I have list with... (6 Replies)
Hi,
I need someone's help in writing correct perl code.
I implemented following code for "multiple search strings replaced with single string".
=========================================================
#!/usr/bin/perl
my $searchStr = 'register_inst\.write_t\(' |... (2 Replies)
Discussion started by: chettyravi
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)