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• How can I convert a 48 hex string to bytes using Perl?

  - by ron

  I have a hex string (length 48 chars) that I want to convert to raw bytes with the pack function in order to put it in a Win32 vector of bytes. How I can do this with Perl?

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• How do I send an arrow key in Perl using the Net::Telnet module?

  - by pokstad

  Using the Perl module Net::Telnet, how do you send an arrow key to a telnet session so that it would be the same thing as a user pressing the down key on the keyboard? use Net::Telnet; my $t = new Net::Telnet(); my $down_key=?; #How do you send a down key in a telnet session? t->print($down_key);

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• How can I download options data from yahoo using Perl?

  - by CptanPanic

  I am trying to get yahoo options data into mysql using perl. I found modules to download stock prices, but not options data. Anyone know what would be the easiest way to do that? If I have to roll my own, what modules should I use? Thanks, CP

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• How can I manually interpolate string escapes in a Perl string?

  - by Ryan Thompson

  In perl suppose I have a string like 'hello\tworld\n', and what I want is: 'hello world ' That is, "hello", then a literal tab character, then "world", then a literal newline. Or equivalently, "hello\tworld\n" (note the double quotes). In other words, is there a function for taking a string with escape sequences and returning an equivalent string with all the escape sequences interpolated?

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• How can I transfer a hash using client and server in Perl?

  - by abubacker

  I just want to transfer (send or receive) a hash from client to server. Can you tell me which is a preferable way in Perl or can you suggest any CPAN modules?

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• How do I use sprintf to zero fill to a variable length in Perl?

  - by Michael Shnitzer

  I want to use perl's sprintf to zerofill a variable. sprintf("%08d", $var); but I want the dynamically determine how many digits to zero fill. How do I replace the "8" in sprintf("%08d", $var) with a variable called $zerofill. Thanks.

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• Perl: How do I remove the first line of a file without reading and copying whole file.

  - by dr jerry

  I do have a whole bunch of files in a directory and from every file I want to remove the first line (including carriage return). I can read the whole file into an array of strings and write all but the first element to a new file, but that looks a bit cumbersome to me are there better ways? Oh the prefered language is Perl.

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• What is the preferred unit testing framework for Perl?

  - by Mike

  I'm sort of new to Perl and I'm wondering if there a prefered unit testing framework? Google is showing me some nice results, but since I'm new to this, I don't know if there is a clear preference within the community.

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• How can I print text immediately without waiting for a newline in Perl?

  - by synapz

  I have a computationally expensive task in perl, and would like to inform the user that computation is ongoing by printing out a period after each portion of the computation is completed. Unfortunately, until I print a "\n", none of my periods are printed. How can I address this?

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• How can I comment out only part of a line in Perl?

  - by Hermann Ingjaldsson

  How do I comment a part of a single line in Perl? like the following line: if($clevel==0){#never happends} i would like to be able to comment that last closing bracket, without going to a new line.

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• How to execute a page's javascript function in perl?

  - by Andrei dela Cruz

  I am trying to extract data from a website using PERL. Below is the description of the site: site displays data dependent on a date a calendar is displayed that is used to change the date upon clicking the dates in the calendar, it calls a javascript function that passes in the date and refreshes the part of the page that displays the data My question is, how do I execute that JS function so that I could loop through the dates that I need data from? Thanks in Advance

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• How can I dynamically build a Java classpath in Perl?

  - by joe

  For Example in shell script: _CLASSPATH =. for jar in lib/*.jar do _CLASSPATH=${_CLASSPATH}:${jar} done How can I dynamically build a Java classpath in Perl?

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• Cleanup Perl code: my $export = $doc; $export =~ s:\.odt:\.pdf:;

  - by C.W.Holeman II

  Perl code fragment: my $export = $doc; $export =~ s:\.odt:\.pdf:; How would this be written cleaner? Not simply what are 900 other ways to write it, TMTOWTDI.

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• How can i check if a file exists in Perl?

  - by superstar

  I am a newbie to perl. My problem is... I have a relative path $base_path = input/myMock.TGZ The filename can change. But the path is always stored in $base_path. I need to check if the file exists in $base_path. Any suggestions are helpful to me

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• Cleanup Perl code: my $export2 = $doc; $export2 =~ s:\.odt:\.pdf:;

  - by C.W.Holeman II

  Perl code fragment: my $export = $doc; $export =~ s:\.odt:\.pdf:; How would this be written cleaner? Not simply what are 900 other ways to write it, TMTOWTDI.

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• How can I enter a password using Perl and replace the characters with '*'?

  - by MatthieuF

  I have a Perl script that requires the user to enter a password. How can I echo only '*' in place of the character that the user types, as they type it? I'm using Windows XP/Vista.

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• Where can find examples and tutorials for Perl's Net::Pcap module?

  - by dan

  Could someone provide a good documentation / tutorial/ PDFs/ reference to book link about Net::Pcap in addtion to the module documentation and this Perl and Net::Pcap article on PerlMonks?

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• Perl daemon script for message queue hanging for 20 seconds after each process. Why?

  - by Mike Diena

  I have daemon script written in Perl that checks a database tables for rows, pulls them in one by one, sends the contents via HTTP post to another service, then logs the result and repeats (only a single child). When there are rows present, the first one is posted and logged immediately, but every subsequent one is delayed for around 20 seconds. There are no sleep()'s running, and I can't find any other obvious delays. Any ideas?

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• What is the best way to achieve `sscanf`-like functionality in perl?

  - by Alphaneo

  What is the best way to achieve sscanf-like functionality in perl? I am looking now looking at the sscanf module, Which is better, Option-1: Going sscanf way? Option-2: Regex way? [I am a beginner when it comes to Regex]

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• When does the difference between a string and a number matter in Perl 5?

  - by Chas. Owens

  If a string in Perl 5 passes looks_like_number, it might as well be a number. For instance, my $s = "10" + 5; results in $s being assigned 15. Are there any cases where a string does not behave like it's numeric equivalent would have?

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• How do I parse an HTML website using Perl?

  - by Nano HE

  Could you please give me some suggestions on how to parse HTML in Perl? I plan to parse the keywords(including URL links) and save them to a MySQL database. I am using Windows XP. Also, do I first need to download some website pages to the local hard drive with some offline Explorer tool? If I do, could you point me to a good download tool?

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• In Perl, how do I get the directory or path of the current executing code?

  - by Ross Rogers

  If I am in some library code, how do I determine the path to the file of the code that is currently executing? I know how to get the path of the top perl file by looking at ARGV, but if I load a library, how can that library know which path it is at?

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• How can I check for a file size and add that result in an Excel spreadsheet in Perl?

  - by Nano Taboada

  Currently I monitoring a particular file with a simple shell one-liner: filesize=$(ls -lah somefile | awk '{print $5}') I'm aware that Perl has some nice modules to deal with Excel files so the idea is to, let's say, run that check daily, perhaps with cron, and write the result on a spreadsheet for further statistical use.

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• Do you know a database written in Perl with DBI interface?

  - by Aftershock

  Hi, Do you know a database written in Perl with DBI interface? Or what can be used if there is no MySql or Postgresql installed? Thank you.

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• Perl: is there a simple way to validate a hash of hash element exist and defined?

  - by WL

  I need to validate a Perl hash of hash element such as $Table{$key1}{$key2} exist and defined. Here is what i do. (i have no idea key1 even exist) if ((defined $Table{$key1}) && (exists $Table{$key1}) && (defined $Table{$key1}{$key2}) && (exists $Table{$key1}{$key2})) { #do whatever } Is there an easier and cleaner way to do it?

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