Any Perl programmer/scripter in the house?

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Mar 22, 2001 | 04:49 PM

PhiTL

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Three Wheelin'

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Any Perl programmer/scripter in the house?

I am writing a script and one part is holding me up.

I want to compare 2 arrays and return the difference between them. EX:

@X = 2,5
@Y = 6,8,5,2

and ultimately return 6 and 8.

I wrote a nested foreach loop to compare each element from each array but it returns too much (6,8,5,6,8,2).

Any help would be appreciated.

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Mar 22, 2001 | 07:17 PM

Red Hot TL

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the difference of what? the greatest number in each arrays? I don't know Perl, but sounds like general ideas. more details could help

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Mar 22, 2001 | 08:31 PM

TLracr

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So you want to compare two strings and return anything thats not an exact match?

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Mar 22, 2001 | 08:46 PM

TLracr

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hehe...watching the terps beating up on the hoyas right now. You guys are pretty good. I'm impressed with that Dixon guy.

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Dark Emerald Pearl 2000 3.2 TL with Nav, Sebring Mufflers, Sebring Quad Sport Exhaust System, Factory Spoiler, HP Quantum Mirror Tint, 6 Disc Alpine CD changer, 16" 139C Pacer wheels, Yokohama 215/55/16s, PIAA 1700x
------------

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Mar 22, 2001 | 09:38 PM

PhiTL

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Three Wheelin'

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OK, hope I can clarify more.

say I have 2 arrays of undefined length I want to return the elements that are unique to the other array. These arrays contains strings in my case IP addresses. Say:

@Array_IP1 = (207.226.255.102, 123.123.123.123, 255.255.255.254)

@Array_IP2 = (123.123.123.123, 255.255.255.254)

I would like a function to read those two arrays and return the unique one. Where in this case would be 207.226.255.102

Thanks for your help.

PS TERPS BABY!!!!!!!!!!!!!!!!!! Dixon is a mad man, gets mad steals! not a great day but Baxter was a monster tonite!!!

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Mar 23, 2001 | 12:05 PM

Red Hot TL

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damn, Perl... I was gonna put it in C++ and hope that you can trasfer it. I can't read that code, well, not really. I would use a search function for the character '.', and when it finds it, it stores the first number into array in the "0" location, and so on. and after that, I'd use a for loop to compare the same position, like "0" position in array one and two, and then one and three til it hits the end. and switch to the "1" array and compare all of them. I'd use integers since you're comparing IP. section by section.

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Mar 23, 2001 | 12:20 PM

avengerjr

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From: Little Elm, TX

Quote:

Originally posted by Red Hot TL:
damn, Perl... I was gonna put it in C++ and hope that you can trasfer it. I can't read that code, well, not really. I would use a search function for the character '.', and when it finds it, it stores the first number into array in the "0" location, and so on. and after that, I'd use a for loop to compare the same position, like "0" position in array one and two, and then one and three til it hits the end. and switch to the "1" array and compare all of them. I'd use integers since you're comparing IP. section by section.

It is easier in PERL to insert and compare the IP's as strings b/c you can split the array on the commas (,) between the IP's. Then comparing 2 strings is easy.

You have to loop through the first array and compare to the second, then loop through the second and compare to the first, b/c you mentioned they could have different lengths. This way you will get all IP's. This also prevents the third array from getting duplicates, and saves you code from having to test for duplicates. Much cleaner.

PERL and C++ are pretty good at just being able to convert code, but PERL to C is a lot better.

I love coding and can do it in PERL, C, C++, JAVA, Korn Shell scripting, HTML,... pretty much whatever I need to code in. That's what I went to school for and what I do everyday!

I will try to see if I can clean up my code that I posted, maybe put some tabs in there to make it easier to read.

------------------
avengerjr
2001 CL-S Satin Silver, spoiler, wheel locks, mud guards, fenderwell trim, Xephyr CAI

"hockey + music + cars = life"

[This message has been edited by avengerjr on March 23, 2001 @ ]

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Mar 23, 2001 | 12:37 PM

avengerjr

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From: Little Elm, TX

footnotes to my code:

Version of PERL is: 5.005_03

Version of UNIX written on: AIX 4.3.3 PSSP 3.1.x

Just so you know, in case there are any problems, you know what I wrote mine on.

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avengerjr
2001 CL-S Satin Silver, spoiler, wheel locks, mud guards, fenderwell trim, Xephyr CAI

"hockey + music + cars = life"

Mar 23, 2001 | 01:10 PM

PhiTL

Thread Starter

Three Wheelin'

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avengerjr and the rest, thanks for your suggestion, I'm sure that would work perfectly, I had similar code in my first attempt to do this but didnt do the pass the second time therefore I got duplicate results(stupid me).

this is what I ended up with. This utilizes hash in perl with I found to be very effective.

[HR]
@A = @StatIPList;
@B = @IPList;
%HashA = ();
%HashB = ();

foreach $a (@A){
$HashA{$a} = "";
}
foreach $b (@B) {
if (exists($HashA{$b})) {
delete ($HashA{$b});
} else{
$HashB{$b} = "";
}
@NetA = keys(%HashA);
@NewIP = keys(%HashB);
}
[HR]

Perl is definately very effective. I am still learning to use perl to its full capabilites but so far its a powerfull language.

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Mar 23, 2001 | 03:33 PM

#10

avengerjr

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From: Little Elm, TX

yup...Hashes are nice, until you start gettin 3 hashes deep. That got me in trouble, when I couldn't keep up with all my hashes and keys...pretty much "I got lost"

I have gotten better and can deal with 2 hashes very easily now, can still work with 3 or more deep, but it gets confusing...

Be careful with those hashes!!!

That code looks good, I prolly would have thought of that, had I had more time and put more thought into it! Good job!

Mar 23, 2001 | 11:58 PM

#11

avengerjr

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Joined: Oct 2000

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From: Little Elm, TX

here ya go... (you have to treat the IP's as strings

)

Code:

#!/bin/perl
@array1 = ('155.155.155.155', '200.200.200.200', '255.255.255.255');
@array2 = ('200.200.200.200', '255.255.255.255', '100.100.100.100', '300.300.300.300');
$found = 0;
for $item (@array1)
{
        for $item2 (@array2)
        {
                if ($item eq $item2)
                {
                        $found = 1;
                }
        }
        if ($found != 1)
        {
                push @array3, $item;
        }
        $found = 0;
}

$found = 0;
for $anitem (@array2)
{
        for $anitem2 (@array1)
        {
                if ($anitem eq $anitem2)
                {
                        $found = 1;
                }
        }
        if ($found != 1)
        {
                push @array3, $anitem;
        }
        $found = 0;
}

for $item3 (@array3)
{
        print ("\narray3 contains :$item3\n");
}

The result is this:

Code:

array3 contains :155.155.155.155

array3 contains :100.100.100.100

array3 contains :300.300.300.300

which contains the 3 IP's that are unique to the 2 arrays. I hope this is what you are looking for...good luck!
------------------
avengerjr
2001 CL-S Satin Silver, spoiler, wheel locks, mud guards, fenderwell trim, Xephyr CAI

"hockey + music + cars = life"

[This message has been edited by avengerjr on March 23, 2001 @ ]

[This message has been edited by avengerjr on March 23, 2001 @ ]

[This message has been edited by avengerjr on March 23, 2001 @ ]