Hi,
I am new to unix. Is their a way to pass the output of the line below to a variable var1.
ls -1t | head -1.
I am trying something like var1=ls -1t | head -1, but I get error.
Situation is: I get file everyday through FTP in my unix box. I have to write a script that picks up first... (1 Reply)
Hello,
I have a file like
was123##abcdefg abddef
was123##xuzaghg agdfgg
was133##CGHAKS DKGJG
from the file i need to print the line after ## where the serach value is passed by an env variable called luster (which is currently set to was123):
i tried using the below code but it... (7 Replies)
I have a script file. test.sh
I am running it by command
sh test.sh 10102004
where 10102004 is the script argument.
I wan to assign this 10102004 to a variable.
How can i do this?
I tried &1 and awks ARGV its not working :( (2 Replies)
Hi,
I had written a shell script to pass command line argument to variable in a function.
Here is my code:
main
if ; then
.$1
echo $1
get_input_file
else
echo "input file $1 is not available"
fi
get_input_file()
{
FILE = "$1"
echo $FILE
} (10 Replies)
Gooday
I have an argument string that contains 15 arguments.
The first 14 arguments are easy to handle because they are separated by spaces
ARG14=`echo ${ARGSTRING} | awk '{print $14}'`
The last argument is a text that may be empty or contain spaces. So any ideas on how I get the last... (23 Replies)
I am trying to get the details of iowait for last hour using sar. When I give date as argument it works.
# sar -u -s 22:24:00 -e 23:24:00
Linux 2.6.35.13-26 (XX.server.com) 04/11/2012
10:30:03 PM CPU %user %nice %system %iowait %idle
10:40:04 PM all 5.03 ... (2 Replies)
Hi,
In directory "inoutfiles", I have folders fold0001, fold0002 and so on. Every folder has corresponding file file0001.txt, file0002.txt and so on. I want to perform a certain action on multiple files in one go. The cpp file is in the same directory as "inoutfiles".
This is my code :
... (1 Reply)
I have a script.
#!/bin/sh
cur_$1_modify_time=Hello
echo "cur_$1_modify_time"
When I run like
sh /root/script1 jj
I expect value "Hello" being assigned to variable "cur_jj_modify_time" and output being "Hello" ie echoing $cur_jj_modify_time
But the output comes as
# sh... (3 Replies)
Hi,
I am trying to pass a variable as an argument to another script. While substitution of variable, I am facing a problem.
varaiable "a" value should be -b "FPT MAIN".
When we pass "a" to another script, we are expecing it to get substitue as ./test.sh -b "FPT MAIN". But, it is getting... (9 Replies)
I want to send the content of a bash variable as a python argument for processing. The problem is that bash doesn't "expand" the content, just sends the expression.
script.sh#!/bin/bash
export RECEIVEDDATE=$(date +"%Y%m%d.%H%M%S")
perl checkdate.py
checkdate.pyimport datetime
import os... (3 Replies)
Discussion started by: Tribe
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)