Introduction to Perl

Boomslang · 07-06-2013, 07:31 PM

Great tutorial thank you Smile

Boomslang · 07-06-2013, 07:31 PM

Great tutorial thank you Smile

ArkPhaze · 07-06-2013, 09:25 PM

You switched over from the Perl comment style to the Lua style the second time I seen this lol:

Code:
-- MyBB was trimming this line, but this should be blank

Although, Perl gets bashed quite a bit, I suppose just like any other language. What I like about Perl though, one of the good things, is that it comes with multi-threading support, and PHP does not as far as I know.

Here was a script I wrote a couple years ago for System Information:

Code:
#!/usr/bin/perl
use Win32::Registry;

$regKey = "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion";
$main::HKEY_LOCAL_MACHINE->Open($regKey, $null) || die "Open: $!"; $null->GetValues(\%ID);

foreach $k (keys %ID) { 
	if ($k eq "RegisteredOwner") {
		$entry = $ID{$k}; 
		print "$$entry[0] = $$entry[2]\n";
	} elsif ($k eq "ProductId") {
		$entry = $ID{$k}; 
		print "$$entry[0] = $$entry[2]\n";
	} elsif ($k eq "SystemRoot") {
		$entry = $ID{$k}; 
		print "$$entry[0] = $$entry[2]\n";
	} elsif ($k eq "ProductName") {
		$entry = $ID{$k}; 
		print "$$entry[0] = $$entry[2]\n";
	} elsif ($k eq "CSDVersion") {
		$entry = $ID{$k}; 
		print "$$entry[0] = $$entry[2]\n";
	} elsif ($k eq "CurrentBuild") {
		$entry = $ID{$k}; 
		print "$$entry[0] = $$entry[2]\n";
	}
}

I haven't done anything in Perl for at least a year now though. I moved onto Python instead. And I don't really like PHP.

edit: Perhaps it could be improved to use a switch statement and regex to match everything since the same thing is done in each if block:

Code:
#!/usr/bin/perl
use Win32::Registry;

$regKey = "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion";
$main::HKEY_LOCAL_MACHINE->Open($regKey, $null) || die "Open: $!"; $null->GetValues(\%ID);

foreach $k (keys %ID) { 
	switch ($k) {
		case "(RegisteredOwner|ProductId|SystemRoot|ProductName|CSDVersion|CurrentBuild)"
		{ $entry = $ID{$k}; print "$$entry[0] = $$entry[2]\n"; }
	}
}

I can't test this anymore right now, I don't have perl installed on my machine.

ArkPhaze · 07-06-2013, 09:25 PM

You switched over from the Perl comment style to the Lua style the second time I seen this lol:

Code:
-- MyBB was trimming this line, but this should be blank

Although, Perl gets bashed quite a bit, I suppose just like any other language. What I like about Perl though, one of the good things, is that it comes with multi-threading support, and PHP does not as far as I know.

Here was a script I wrote a couple years ago for System Information:

Code:
#!/usr/bin/perl
use Win32::Registry;

$regKey = "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion";
$main::HKEY_LOCAL_MACHINE->Open($regKey, $null) || die "Open: $!"; $null->GetValues(\%ID);

foreach $k (keys %ID) { 
	if ($k eq "RegisteredOwner") {
		$entry = $ID{$k}; 
		print "$$entry[0] = $$entry[2]\n";
	} elsif ($k eq "ProductId") {
		$entry = $ID{$k}; 
		print "$$entry[0] = $$entry[2]\n";
	} elsif ($k eq "SystemRoot") {
		$entry = $ID{$k}; 
		print "$$entry[0] = $$entry[2]\n";
	} elsif ($k eq "ProductName") {
		$entry = $ID{$k}; 
		print "$$entry[0] = $$entry[2]\n";
	} elsif ($k eq "CSDVersion") {
		$entry = $ID{$k}; 
		print "$$entry[0] = $$entry[2]\n";
	} elsif ($k eq "CurrentBuild") {
		$entry = $ID{$k}; 
		print "$$entry[0] = $$entry[2]\n";
	}
}

I haven't done anything in Perl for at least a year now though. I moved onto Python instead. And I don't really like PHP.

edit: Perhaps it could be improved to use a switch statement and regex to match everything since the same thing is done in each if block:

Code:
#!/usr/bin/perl
use Win32::Registry;

$regKey = "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion";
$main::HKEY_LOCAL_MACHINE->Open($regKey, $null) || die "Open: $!"; $null->GetValues(\%ID);

foreach $k (keys %ID) { 
	switch ($k) {
		case "(RegisteredOwner|ProductId|SystemRoot|ProductName|CSDVersion|CurrentBuild)"
		{ $entry = $ID{$k}; print "$$entry[0] = $$entry[2]\n"; }
	}
}

I can't test this anymore right now, I don't have perl installed on my machine.

ArkPhaze · 07-06-2013, 09:25 PM

You switched over from the Perl comment style to the Lua style the second time I seen this lol:

Code:
-- MyBB was trimming this line, but this should be blank

Although, Perl gets bashed quite a bit, I suppose just like any other language. What I like about Perl though, one of the good things, is that it comes with multi-threading support, and PHP does not as far as I know.

Here was a script I wrote a couple years ago for System Information:

Code:
#!/usr/bin/perl
use Win32::Registry;

$regKey = "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion";
$main::HKEY_LOCAL_MACHINE->Open($regKey, $null) || die "Open: $!"; $null->GetValues(\%ID);

foreach $k (keys %ID) { 
	if ($k eq "RegisteredOwner") {
		$entry = $ID{$k}; 
		print "$$entry[0] = $$entry[2]\n";
	} elsif ($k eq "ProductId") {
		$entry = $ID{$k}; 
		print "$$entry[0] = $$entry[2]\n";
	} elsif ($k eq "SystemRoot") {
		$entry = $ID{$k}; 
		print "$$entry[0] = $$entry[2]\n";
	} elsif ($k eq "ProductName") {
		$entry = $ID{$k}; 
		print "$$entry[0] = $$entry[2]\n";
	} elsif ($k eq "CSDVersion") {
		$entry = $ID{$k}; 
		print "$$entry[0] = $$entry[2]\n";
	} elsif ($k eq "CurrentBuild") {
		$entry = $ID{$k}; 
		print "$$entry[0] = $$entry[2]\n";
	}
}

I haven't done anything in Perl for at least a year now though. I moved onto Python instead. And I don't really like PHP.

edit: Perhaps it could be improved to use a switch statement and regex to match everything since the same thing is done in each if block:

Code:
#!/usr/bin/perl
use Win32::Registry;

$regKey = "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion";
$main::HKEY_LOCAL_MACHINE->Open($regKey, $null) || die "Open: $!"; $null->GetValues(\%ID);

foreach $k (keys %ID) { 
	switch ($k) {
		case "(RegisteredOwner|ProductId|SystemRoot|ProductName|CSDVersion|CurrentBuild)"
		{ $entry = $ID{$k}; print "$$entry[0] = $$entry[2]\n"; }
	}
}

I can't test this anymore right now, I don't have perl installed on my machine.

noize · 07-06-2013, 10:12 PM

(07-06-2013, 09:25 PM)ArkPhaze Wrote:
Code:
#!/usr/bin/perl use Win32::Registry; $regKey = "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion"; $main::HKEY_LOCAL_MACHINE->Open($regKey, $null) || die "Open: $!"; $null->GetValues(\%ID); foreach $k (keys %ID) { switch ($k) { case "(RegisteredOwner|ProductId|SystemRoot|ProductName|CSDVersion|CurrentBuild)" { $entry = $ID{$k}; print "$$entry[0] = $$entry[2]\n"; } } }

I can't test this anymore right now, I don't have perl installed on my machine.

This last script of yours does not work. On line 9, string where operator expected, so I tried removing the quotes around the brackets of the condition. Then I tried putting quotes around each one of the conditions, tried duplicating pipes, none of these worked (neither combined together).

Tried also:

Code:
case /^(RegisteredOwner|ProductId|SystemRoot|ProductName|CSDVersion|CurrentBuild)$/

and

Code:
case /^(?:RegisteredOwner|ProductId|SystemRoot|ProductName|CSDVersion|CurrentBuild)$/

Still can't get it right.

But... do you know all programming languages? :wacko:

Also, I changed the comment syntax for code and code (even in the PHP code the comment style is not Perl's).

ArkPhaze · 07-07-2013, 03:38 AM

As I said I can't test, and like C++, you can't do this in Perl if I remember correctly:

Code:
case x:
case y:
{
// case x and y
}

Or any similar version of that in Perl. So for string cases, people were using Regex. And I don't know all of them, but I've fooled around with many of them. However, once you know a programming language, you pretty much know *all* of them... All of the languages I've played around with cover pretty much all of the programming syntax out there though, so even if I haven't programmed in a specific language yet, I know of one other language most of the time, that I have used, and in which is similar.

Off the top of my head, I've used in the past: LISP, ASM, Batch, C, C++, C#, VB.net, PHP, Javascript, Lua, Python, PHP, OCaml, Java, Perl, F#, ObjectiveC, BASIC, Powershell, and VBS... (With maybe a couple missing)

About 20% of that list though, I *truly* know as of today however. There's lots of scripting languages however that are similar to Perl though out there.

noize · 07-07-2013, 09:08 AM

I had found some way to do that (one action per multiple cases) in Perl, but no one seems to work.

How about this?

Code:
#!/usr/bin/perl
use Win32::Registry;

$regKey = "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion";
$main::HKEY_LOCAL_MACHINE->Open($regKey, $null) || die "Open: $!"; $null->GetValues(\%ID);

foreach $k (keys %ID) { 
    if ($k eq "RegisteredOwner" || $k eq "ProductID" || $k eq "SystemRoot" || $k eq "ProductName" || $k eq "CSDVersion" || $k eq "CurrentBuild") {
        $entry = $ID{$k}; 
        print "$$entry[0] = $$entry[2]\n";
    }
}

It works this way.

noize · 07-07-2013, 09:08 AM

I had found some way to do that (one action per multiple cases) in Perl, but no one seems to work.

How about this?

Code:
#!/usr/bin/perl
use Win32::Registry;

$regKey = "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion";
$main::HKEY_LOCAL_MACHINE->Open($regKey, $null) || die "Open: $!"; $null->GetValues(\%ID);

foreach $k (keys %ID) { 
    if ($k eq "RegisteredOwner" || $k eq "ProductID" || $k eq "SystemRoot" || $k eq "ProductName" || $k eq "CSDVersion" || $k eq "CurrentBuild") {
        $entry = $ID{$k}; 
        print "$$entry[0] = $$entry[2]\n";
    }
}

It works this way.

noize · 07-07-2013, 09:08 AM

I had found some way to do that (one action per multiple cases) in Perl, but no one seems to work.

How about this?

Code:
#!/usr/bin/perl
use Win32::Registry;

$regKey = "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion";
$main::HKEY_LOCAL_MACHINE->Open($regKey, $null) || die "Open: $!"; $null->GetValues(\%ID);

foreach $k (keys %ID) { 
    if ($k eq "RegisteredOwner" || $k eq "ProductID" || $k eq "SystemRoot" || $k eq "ProductName" || $k eq "CSDVersion" || $k eq "CurrentBuild") {
        $entry = $ID{$k}; 
        print "$$entry[0] = $$entry[2]\n";
    }
}

It works this way.

Introduction to Perl
Author Message