CORE(3pm) Perl Programmers Reference Guide CORE(3pm)NAME
CORE - Pseudo-namespace for Perl's core routines
SYNOPSIS
BEGIN {
*CORE::GLOBAL::hex = sub { 1; };
}
print hex("0x50"),"
"; # prints 1
print CORE::hex("0x50"),"
"; # prints 80
DESCRIPTION
The "CORE" namespace gives access to the original built-in functions of Perl. There is no "CORE" package, and therefore you do not need to
use or require an hypothetical "CORE" module prior to accessing routines in this namespace.
A list of the built-in functions in Perl can be found in perlfunc.
OVERRIDING CORE FUNCTIONS
To override a Perl built-in routine with your own version, you need to import it at compile-time. This can be conveniently achieved with
the "subs" pragma. This will affect only the package in which you've imported the said subroutine:
use subs 'chdir';
sub chdir { ... }
chdir $somewhere;
To override a built-in globally (that is, in all namespaces), you need to import your function into the "CORE::GLOBAL" pseudo-namespace at
compile time:
BEGIN {
*CORE::GLOBAL::hex = sub {
# ... your code here
};
}
The new routine will be called whenever a built-in function is called without a qualifying package:
print hex("0x50"),"
"; # prints 1
In both cases, if you want access to the original, unaltered routine, use the "CORE::" prefix:
print CORE::hex("0x50"),"
"; # prints 80
AUTHOR
This documentation provided by Tels <nospam-abuse@bloodgate.com> 2007.
SEE ALSO
perlsub, perlfunc.
perl v5.12.1 2010-04-26 CORE(3pm)
Check Out this Related Man Page
Time::localtime(3pm) Perl Programmers Reference Guide Time::localtime(3pm)NAME
Time::localtime - by-name interface to Perl's built-in localtime() function
SYNOPSIS
use Time::localtime;
printf "Year is %d
", localtime->year() + 1900;
$now = ctime();
use Time::localtime;
use File::stat;
$date_string = ctime(stat($file)->mtime);
DESCRIPTION
This module's default exports override the core localtime() function, replacing it with a version that returns "Time::tm" objects. This
object has methods that return the similarly named structure field name from the C's tm structure from time.h; namely sec, min, hour, mday,
mon, year, wday, yday, and isdst.
You may also import all the structure fields directly into your namespace as regular variables using the :FIELDS import tag. (Note that
this still overrides your core functions.) Access these fields as variables named with a preceding "tm_" in front their method names.
Thus, "$tm_obj->mday()" corresponds to $tm_mday if you import the fields.
The ctime() function provides a way of getting at the scalar sense of the original CORE::localtime() function.
To access this functionality without the core overrides, pass the "use" an empty import list, and then access function functions with their
full qualified names. On the other hand, the built-ins are still available via the "CORE::" pseudo-package.
NOTE
While this class is currently implemented using the Class::Struct module to build a struct-like class, you shouldn't rely upon this.
AUTHOR
Tom Christiansen
perl v5.18.2 2013-11-04 Time::localtime(3pm)
hi,
i am a computer engineering student.i need ideas for my final year project
i want to do my project in CORE SYSTEMS / KERNEL PROGRAMMING (Unix Platform).
i have very good knowledge of c,done 386 architecture & programming in detail, also d one D.O.S device drivers,but i am... (2 Replies)
I have a file (called CORE) that is a dump created by a crashing process. This file, I believe, is in "binary" form, so when I try to use cat, more, or vi on it, it has a bunch of garbage. Is there anything I can use to "read" or view this file just like I might a non-binary file? I am running... (2 Replies)
ok i have this script called script.nawk:
BEGIN {print "List\n"}
BEGIN {print "AL"}
BEGIN {print "AM"}
/EAST/ {print $3, $2}
END {print "End of Report"}
How would I change this so that I don't have to type nawk -f script.nawk filename?
Instead just run it as a korn script?
thanks! (18 Replies)
Hi,
I am going to buy a software that is licenced per CORE.
I have a HPUX B1123 64 bit with 8 cpus.
How can i know how many cores are in my machine ?
Thanks (3 Replies)
Hi friends, I want to search for some hex error codes in some files.
After the hex error code is found, the occurences would be counted.
Afterwards the found hex errorcode would be cat into a separate file.
Here is my code:
#!/usr/bin/perl
use File::Basename;
my $find = $ARGV;
my... (2 Replies)
I am looking to create a perl script which will take numbers from a simple text file, convert them from decimal to hex, and then rewrite those values in the file or create a new file with the hex numbers(whichever's easier).
My text document for example would be something as simple as
1312... (6 Replies)
Hi,
Iam using OMAP4430 panda board for my project development. It has ARM Cortex A9 MP Core (CORE-'0' & CORE-'1') and iam using linux-2.6.38. Iam just trying to understand the booting sequence for CORE-1.
As per my understanding the CORE-1 is triggered from wakeup_secondary(void) in... (1 Reply)
I am new to UNIX.
My Application is using c (.so files) and Java code.
My application crashes and CORE DUMP file is generated ,which is huge.
Now I want to view the CORE DUMP file to debug the application using dbx without starting process again.
By only using the CORE DUMP file and dbx ,can i... (1 Reply)