This is my list of sed commands: can anyone tell me where im going wrong. The script works on a file called data which contains 6 student id's and there answers for 6 questions.
!/bin/sh
sed -e 's/*//g' \ #replace * with nothing
-e s/ /X/g' \ #replacing empty space with X
-e... (2 Replies)
hello all
im trying to use in sun Solaris the information received from the top command
now i several machines that dont have install the top program so when im running the script im geting error
saying after im running this code :
set MemoryInfo = `top | grep Memory`
if (... (2 Replies)
Hi, I want to write a script that runs a command (at -l) and writes the output to a file. If the command (at -l) command returns no value (is empty/null) then write a message to the file in place of the command output.
My problem is around trapping the empty returned command value and replacing... (2 Replies)
I need to awk a value out of a file and see if it exists in another file.
My if statement below returns a positive even if the value doesn't exist.
The kky3 is finding the correct field for the value.
cat $PRE | while read a
do
kky2=`echo $a | awk -F: '{print $2}'`
echo "kky2 "... (5 Replies)
Hi,
How do you echo something once when a find statement returns null results?
This is when using mutiple locations and mutiple arguments.
The below find command the inner loop of a nested for loop where the outter loop holds the $args and the inner loop holds the locations.
find... (2 Replies)
my intension is to use a grep command inside the shell script
and if any row is returned or not..
depending on the resultset i have to code on further.
how to check this
i mean.. could anyone help me out with the if condition how to use it here !! (4 Replies)
$ host 80.159.xx.xxx
Host 222.79.xxx.xxx.in-addr.arpa not found: 3(NXDOMAIN)
What does this mean? The person currently using the IP address in IRC is chatting right now, but how come if he's online it doesn't return any information? (1 Reply)
Hi there,
I have 2 HP-UX on same subnet and having a problem on one about ping. I'll call them as hp01 hp02.
hp01 can ping hp02 (ping says %100 transmitted)
hp01 can ssh/telnet hp02
hp02 can ssh/telnet hp01
hp02 cannot ping hp02 (ping says %100 packet loss)
There I thought of ndd... (4 Replies)
Under one of my directories on server I have more than 500 files with different type and name. When I run the find command to list the files with 'ABC_DEFGH' in the begining of its name and older than 20 days, nothing is return as result. Though I know there are more than 400 files which their name... (10 Replies)
Hi there, I'm currently working on an exercise to connect to a Windows iscsi target via a Red Hat initiator machine. I'm using Windows Server 2012 and Red Hat Enterprise Linux v7.1
I have created the target on the Windows Server box and the two devices can communicate with each other. Verified... (3 Replies)
Discussion started by: Tech87
3 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)