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• How can I debug a Perl program that suddenly exits?

  - by taw

  I have Perl program based on IO::Async, and it sometimes just exits after a few hours/days without printing any error message whatsoever. There's nothing in dmesg or /var/log either. STDOUT/STDERR are both autoflush(1) so data shouldn't be lost in buffers. It doesn't actually exit from IO::Async::Loop->loop_forever - print I put there just to make sure of that never gets triggered. Now one way would be to keep peppering the program with more and more prints and hope one of them gives me some clue. Is there better way to get information what was going on in a program that made it exit/silently crash?

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• Perl: Why does "use strict" not let me pass a parameter hash?

  - by Thariama

  I hava a perl subroutine where i would like to pass parameters as a hash (the aim is to include a css depending on the parameter 'iconsize'). I am using the call: get_function_bar_begin('iconsize' => '32'); for the subroutine get_function_bar_begin: use strict; ... sub get_function_bar_begin { my $self = shift; my %template_params = %{ shift || {} }; return $self->render_template('global/bars /tmpl_incl_function_bar_begin.html',%template_params); } Why does this yield the error message: Error executing run mode 'start': undef error - Can't use string ("iconsize") as a HASH ref while "strict refs" in use at CheckBar.pm at line 334 Am i doing something wrong here? Is there an other way to submit my data ('iconsize') as a hash?

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• How to output list of float text to binary file in Perl ?

  - by YoDar

  Hi, I have text file looks like that: float a[10] = { 7.100000e+000 , 9.100000e+000 , 2.100000e+000 , 1.100000e+000 , 8.200000e+000 , 7.220000e+000 , 7.220000e+000 , 7.222000e+000 , 1.120000e+000 , 1.987600e+000 }; unsigned int col_ind[10] = { 1 , 4 , 3 , 4 , 5 , 2 , 3 , 4 , 1 , 5 }; Now, I want to convert each array (float / unsigned int) to different binary files - big endian type. Binary file for all float values and binary file for all integer values. What is the simple way to do it in Perl, consider I have over 2 millon elements in each array? Thanks, Yodar.

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• How do we match any single character including line feed in Perl regular expression?

  - by bobo

  I would like to use UltraEdit regular expression (perl) to replace the following text with some other text in a bunch of html files: <style type="text/css"> #some-id{} .some-class{} //many other css styles follow </style> I tried to use <style type="text/css">.*</style> but of course it wouldn't match anything because the dot matches any character except line feed. I would like to match line feed as well and the line feed maybe either \r\n or \n. How should the regular expression look like? Many thanks to you all.

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• How can I map URLs to filenames with perl?

  - by eugene y

  In a simple webapp I need to map URLs to filenames or filepaths. This app has a requirement that it can depend only on modules in the core Perl ditribution (5.6.0 and later). The problem is that filename length on most filesystems is limited to 255. Another limit is about 32k subdirectories in a single folder. My solution: my $filename = $url; if (length($filename) > $MAXPATHLEN) { # if filename longer than 255 my $part1 = substr($filename, 0, $MAXPATHLEN - 13); # first 242 chars my $part2 = crypt(0, substr($filename, $MAXPATHLEN - 13)); # 13 chars hash $filename = $part1.$part2; } $filename =~ s!/!_!g; # escape directory separator Is it reliable ? How can it be improved ?

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• In Perl, how can I iterate over the Cartesian product of multiple sets?

  - by nubie2

  I want to do permutation in Perl. For example I have three arrays: ["big", "tiny", "small"] and then I have ["red", "yellow", "green"] and also ["apple", "pear", "banana"]. How do I get: ["big", "red", "apple"] ["big", "red", "pear"] ..etc.. ["small", "green", "banana"] I understand this is called permutation. But I am not sure how to do it. Also I don't know how many arrays I can have. There may be three or four, so I don't want to do nested loop.

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• Is it good practice to export variables in Perl?

  - by gvkv

  I'm finding it very convenient to pass configuration and other data that is read or calculated once but then used many times throughout a program by using Perl's use mechanism. I'm doing this by exporting a hash into the caller's namespace. For example: package Myconfiguration; my %config; sub import { my $callpkg = caller(0); my $expsym = $_[1]; configure() unless %config; *{"$callpkg\::$expsym"} = \%config; } and then in other modules: use MyConfiguration (loc_config_sym); if ( $loc_config_sym{paramater} ) { # ... do stuff ... } However, I'm not sure about this as a best practice. Is it better to add a method that returns a hash ref with the data? Something else?

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• Why does Term::Size seem to mess up Perl's output encoding?

  - by sid_com

  Hello! The Term::Size-module jumbles up the encoding. How can I fix this? #!/usr/bin/env perl use warnings; use strict; use 5.010; use utf8; binmode STDOUT, ':encoding(UTF-8)'; use Term::Size; my $string = 'Hällö'; say $string; my $columns = ( Term::Size::chars *STDOUT{IO} )[0]; say $columns; say $string; Output: Hällö 140 H?ll?

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• mature, powerful Perl library to support text/string operation ?

  - by user534009

  Do we have a mature, powerful Perl library to support text/string operation ? for example, if I need to trim a string, I need to write a function like below. Then question is, do we have an existing API so that I can import and call it ? just like StringUtils.trim(s) in Apache Common Lang. Thanks. sub trim($) { my $string = shift; $string =~ s/^\s+//; $string =~ s/\s+$//; return $string; }

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• What's the fastest way to get directory and subdirs size on unix using Perl?

  - by ivicas

  I am using Perl stat() function to get the size of directory and its subdirectories. I have a list of about 20 parent directories which have few thousand recursive subdirs and every subdir has few hundred records. Main computing part of script looks like this: sub getDirSize { my $dirSize = 0; my @dirContent = <*>; my $sizeOfFilesInDir = 0; foreach my $dirContent (@dirContent) { if (-f $dirContent) { my $size = (stat($dirContent))[7]; $dirSize += $size; } elsif (-d $dirContent) { $dirSize += getDirSize($dirContent); } } return $dirSize; } The script is executing for more than one hour and I want to make it faster. I was trying with the shell du command, but the output of du (transfered to bytes) is not accurate. And it is also quite time consuming. I am working on HP-UNIX 11i v1.

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• How do I call Informix stored procedures from Perl?

  - by superjtc

  How do I call informix stored procedures from Perl? I use DBD::ODBC to connect to informix database, but I don't know how to call procedures. my code like this: my $dbh=DBI->connect("dbi:".DBDRIVE.":".DBNAME,DBUSER,DBPASS,{RaiseError=>0,PrintError=>0,AutoCommit=>1}) ||die $DBI::errstr; $dbh->do("execute procedure sp_test('2010-05-01 00:00:00')") || warn "failed\n"; $dbh->disconnect(); when I run it, it didn't get error. But I get nothing when I check the database. the store procedure works fine if I run it in database directly. Anyone can help me out?

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• How do I filter or retain duplicates in Perl?

  - by manu

  I have one text string which is having some duplicate characters (FFGGHHJKL). These can be made unique by using the positive lookahead: $ perl -pe 's/(.)(?=.*?\1)//g'] For example, with "FFEEDDCCGG", the output is "FEDCG". My question is how to make it work on the numbers (Ex. 212 212 43 43 5689 6689 5689 71 81 === output should be 212 43 5689 6689 71 81) ? Also if we want to have only duplicate records to be given as the output from a file having n rows 212 212 43 43 5689 6689 5689 71 81 66 66 67 68 69 69 69 71 71 52 .. Output: 212 212 43 43 5689 5689 66 66 69 69 69 71 71 How can I do this?

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• How can I start XServer in Linux through apache user triggered by Perl script running in background?

  - by Nikhil

  I am trying to launch MS Office through WINE using a PERL script hosted by apache and and triggered by other application. I am getting the following error message in log files "Application trying to create a window but no driver could not be loaded. Make sure that your X server is running and that $DISPLAY is set correctly". If I run the script directly on shell prompt using root user then WINE starts XServer properly and execute MS MSoffice in addition to that if I set xhost +local:apache on shell prompt then also it works fine. How can I start the XServer from apache user?

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• [perl] where can i find an array of the Unicode code points for a particular block?

  - by gitparade

  At the moment, I'm writing these arrays by hand. For example, the Miscellaneous Mathematical Symbols-A block has an entry in hash like this: my %symbols = ( ... miscellaneous_mathematical_symbols_a => [(0x27C0..0x27CA), 0x27CC, (0x27D0..0x27EF)], ... ) The simpler, 'continuous' array miscellaneous_mathematical_symbols_a => [0x27C0..0x27EF] doesn't work because Unicode blocks have holes in them. For example, there's nothing at 0x27CB. Take a look at the code chart [PDF]. Writing these arrays by hand is tedious, error-prone and a bit fun. And I get the feeling that someone has already tackled this in Perl!

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• how to query sqlite for certain rows, i.e. dividing it into pages (perl DBI)

  - by user1380641

  sorry for my noob question, I'm currently writing a perl web application with sqlite database behind it. I would like to be able to show in my app query results which might get thousands of rows - these should be split in pages - routing should be like /webapp/N - where N is the page number. what is the correct way to query the sqlite db using DBI, in order to fetch only the relavent rows. for instance, if I show 25 rows per page so I want to query the db for 1-25 rows in the first page, 26-50 in the second page etc.... Thanks in advanced!

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• How can I pad part of a string with spaces, in Perl?

  - by sid_com

  Hello! Which version would you prefer? #!/usr/bin/env perl use warnings; use strict; use 5.010; my $p = 7; # 33 my $prompt = ' : '; my $key = 'very important text'; my $value = 'Hello, World!'; my $length = length $key . $prompt; $p -= $length; Option 1: $key = $key . ' ' x $p . $prompt; Option 2: if ( $p > 0 ) { $key = $key . ' ' x $p . $prompt; } else { $key = $key . $prompt; } say "$key$value"

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• can i use perl to download files in a php script?

  - by jision

  i have a file sharing website made in php which gives users to download files.But as i am using a hosted server there is limitation on time out and other factors that come to play while for a download script coded in php. This causes large files to get corrupted while downloading. i am looking for a solution for this i have tried using symbolic links but the force download factor is not taking place.... i am thinking of using perl to download files bt dont have any clue what so ever.... can any one help me outwith this problem???

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• How can I get the file extensions from relative links in HTML text using Perl?

  - by Structure

  For example, scanning the contents of an HTML page with a Perl regular expression, I want to match all file extensions but not TLD's in domain names. To do this I am making the assumption that all file extensions must be within double quotes. I came up with the following, and it is working, however, I am failing to figure out a way to exclude the TLDs in the domains. This will return "com", "net", etc. m/"[^<>]+\.([0-9A-Za-z]*)"/g Is it possible to negate the match if there is more than one period between the quotes that are separated by text? (ie: match foo.bar.com but not ./ or ../) Edit I am using $1 to return the value within parentheses.

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• How can a Perl force its caller to return? [closed]

  - by JS Bangs

  Possible Duplicate: Is it possible for a Perl subroutine to force its caller to return? I want to write a subroutine which causes the caller to return under certain conditions. This is meant to be used as a shortcut for validating input to a function. What I have so far is: sub needs($$) { my ($condition, $message) = @_; if (not $condition) { print "$message\n"; # would like to return from the *parent* here } return $condition; } sub run_find { my $arg = shift @_; needs $arg, "arg required" or return; needs exists $lang{$arg}, "No such language: $arg" or return; # etc. } The advantage of returning from the caller in needs would then be to avoid having to write the repetitive or return inside run_find and similar functions.

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• apt-get broken + dependencies issue + many software uninstalled

  - by vnc786

  OS=ubuntu 12.04 64bit 3.2.0-29-generic what i did? apt-get purge libre* which i thought will remove LO 3.5 but, which was a big mistake after couple of moments, i realise that its is removing all other software so i did cltl-c which stopped the apt process i restarted my system after that i found that following software were missing apt-get,evince(pdf), cheese etc..here is full list http://pastebin.com/CWHrw10y i managed to install APT deb file through dpkg but now i am not able to do any installation so i just removed /var/lib/dpkg/status and created new but that didnt help apt-get -f install Reading package lists... Done Building dependency tree Reading state information... Done Correcting dependencies... Done The following extra packages will be installed: apt-utils coreutils debconf debconf-i18n dpkg libacl1 libapt-inst1.4 libapt-pkg4.12 libattr1 libbz2-1.0 libdb5.1 libgcc1 liblocale-gettext-perl liblzma5 libselinux1 libstdc++6 libtext-charwidth-perl libtext-iconv-perl libtext-wrapi18n-perl perl-base tar tzdata xz-utils zlib1g Suggested packages: debconf-doc debconf-utils whiptail dialog gnome-utils libterm-readline-gnu-perl libgtk2-perl libnet-ldap-perl libqtgui4-perl libqtcore4-perl apt bzip2 ncompress xz-lzma The following NEW packages will be installed: apt-utils coreutils debconf debconf-i18n dpkg libacl1 libapt-inst1.4 libapt-pkg4.12 libattr1 libbz2-1.0 libdb5.1 libgcc1 liblocale-gettext-perl liblzma5 libselinux1 libstdc++6 libtext-charwidth-perl libtext-iconv-perl libtext-wrapi18n-perl perl-base tar tzdata xz-utils zlib1g 0 upgraded, 24 newly installed, 0 to remove and 0 not upgraded. 2 not fully installed or removed. Need to get 0 B/9,246 kB of archives. After this operation, 29.9 MB of additional disk space will be used. Do you want to continue [Y/n]? y E: Cannot get debconf version. Is debconf installed? debconf: apt-extracttemplates failed: No such file or directory dpkg: regarding .../libgcc1_1%3a4.6.3-1ubuntu5_amd64.deb containing libgcc1, pre-dependency problem: libgcc1 pre-depends on multiarch-support multiarch-support is unpacked, but has never been configured. dpkg: error processing /var/cache/apt/archives/libgcc1_1%3a4.6.3-1ubuntu5_amd64.deb (--unpack): pre-dependency problem - not installing libgcc1 No apport report written because MaxReports is reached already Errors were encountered while processing: /var/cache/apt/archives/libgcc1_1%3a4.6.3-1ubuntu5_amd64.deb E: Internal Error, No file name for libc6 W: Could not perform immediate configuration on 'multiarch-support:amd64'. Please see man 5 apt.conf under APT::Immediate-Configure for details. (2) E: Sub-process /usr/bin/dpkg returned an error code (1) # apt-get -u dist-upgrade Reading package lists... Done Building dependency tree Reading state information... Done You might want to run 'apt-get -f install' to correct these. The following packages have unmet dependencies: libc6 : Depends: libgcc1 but it is not installed Depends: tzdata but it is not installed E: Unmet dependencies. Try using -f. i have tried below link Unable to install due to debconf problem How do I resolve unmet dependencies? but no help... thanks

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• How does the GPL static vs. dynamic linking rule apply to interpreted languages?

  - by ekolis

  In my understanding, the GPL prohibits static linking from non-GPL code to GPL code, but permits dynamic linking from non-GPL code to GPL code. So which is it when the code in question is not linked at all because the code is written in an interpreted language (e.g. Perl)? It would seem to be too easy to exploit the rule if it was considered dynamic linking, but on the other hand, it would also seem to be impossible to legally reference GPL code from non-GPL code if it was considered static! Compiled languages at least have a distinction between static and dynamic linking, but when all "linking" is just running scripts, it's impossible to tell what the intent is without an explicit license! Or is my understanding of this issue incorrect, rendering the question moot? I've also heard of a "classpath exception" which involves dynamic linking; is that not part of the GPL but instead something that can be added on to it, so dynamic linking is only allowed when the license includes this exception?

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• Rendering citations and references in HTML using PHP/Perl/Python/

  - by Nick

  Is there a PHP/Perl/Python/... library for picking citations out of an HTML file and rendering a nice list of references at the bottom, like in Wikipedia? I'm developing a website with heavily-sourced content, and I'd really like to have automatically-generated lists of formatted references, like in Wikipedia. (Check out their philosophy page, and see how the superscript numbered citations interact with the references at the bottom. This is all dynamically generated, automatically ordered & linked.) They do it really well: the citations are linked to the references (which are backlinked to the citations), when you click on one of the links, the target is highlighted, etc. I'm tempted to build the site on MediaWiki just for this one feature, but it seems like overkill. Do I have any options?

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• Queuing rpc calls

  - by alfa64

  i'm designing a system wich listen to json rpc calls from clients, piles it up inside a list, and if it gets full it should store them in a DB and keep recieving calls. My original plan is to listen to the rpc calls from Perl with the json-rpc and put them in the array. The clients do some long polling in another server to get responses as they appear. What is this blocking/noblocking thing? Should i do a script for node.js to listen to the calls? What do you think is a good practice in this case? The objective is to listen as much calls as possible.

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• What languages should I learn before I go to college? [closed]

  - by CLUEL3SS

  I've been working with PHP, MySQL, and some html for the past 3-4 years now just as a hobby. I'm only 19 and college is going to come soon, I want to go for Web and Software development and/or Network Security and Administration, I know the networking is a whole different ballpark, but as for programming, which languages do you suggest I get under my belt before college? I was thinking the C languages (C++, C#), Java, .NET; Should I learn any more Server Side Scripting languages? Python, Perl, Ruby? I used to be somewhat familiar with writing Java, but haven't written in Java in a good while, what would you suggest? Thanks!

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• What languages should I leaarn before I go to college? [closed]

  - by CLUEL3SS

  I've been working with PHP, MySQL, and some html for the past 3-4 years now just as a hobby.. I'm only 19 and college is going to come soon, I want to go for Web and Software development and/or Network Security and Administration, I know the networking is a whole different ballpark, but as for programming, which languages do you suggest I get under my belt before college? I was thinking the C languages (C++, C#), Java, .NET; Should I learn any more Server Side Scripting languages? Python, Perl, Ruby? I used to be somewhat familiar with writing Java, but haven't written in Java in a good while, what would you suggest? Thanks!

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