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• Writing scripts that work with my emails

  - by queueoverflow

  I currently use Thunderbird as my email client and it has some filters, but that seems to be all I can program in it. On several occasions, I heard people talk about their automated email workflow. One example: When I do not get a reply to an email the script will send a “nag” email asking why I did not get a response yet. Or another one: I get so much mail that I cannot read them all. After a week, unread email is put on hold and the sender gets a “if it was important, reply to this email and it will be set to un-hold” email. The script then takes the answer and move it to back into the important folder. I read about FiltaQuilla which seems nice, but it does not seem to be the kind of programming that I am looking for. How can I write general purpose scripts like those? Do I need to write my own Python IMAP/SMTP client (if that is even possible) to to this or can I script it it, say JavaScript, in Thunderbird?

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• Apache2 doesn't serve PHP-scripts correctly

  - by cmbrnt

  I've run into a problem with my Apache 2.2.16 configuration, running on Debian Squeeze. The problem is that it stopped serving PHP5-scripts completely. When I try to access the sites with Google Chrome, it instead downloads a file called "download", which contains the contents of the script. This is of course not a good thing. It does serve common html-files perfectly... I've been at this for quite a while now, and after all the googling and troubleshooting, I thought it would be a good time to ask you guys. Here's what I've got: The php5 and libapache2-mod-php5 packages are installed /etc/apache2/mods-available contains both php5.load and php5.conf, and these are symlinked from the mods-enabled directory The /etc/php5/ directory is left untouched since the installation. Here's the contents of /etc/apache2/mods-available/php.load: LoadModule php5_module /usr/lib/apache2/modules/libphp5.so And /etc/apache2/mods-available/php.conf: <IfModule mod_php5.c> <FilesMatch "\.ph(p3?|tml)$"> SetHandler application/x-httpd-php </FilesMatch> <FilesMatch "\.phps$"> SetHandler application/x-httpd-php-source </FilesMatch> <IfModule mod_userdir.c> <Directory /home/*/public_html> php_admin_value engine Off </Directory> </IfModule> </IfModule> What am I missing? This is a server with modified virtual hosts and the like, so I might have changed some settings which causes this problem, but simply purging and reinstalling is not an option so far, since the configuration is quite extensive. Any help would be great. Thanks.

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• CentOS: Init scripts failing to start for some unknown reason

  - by user705142

  I'm running CentOS 6.2 - I've just migrated some applications over to a failover server, and copied their init scripts into /etc/init.d. I've made them executable, added them to chkconfig, with chkconfig -add, set their levels, made sure they're residing in /etc/rc.d/ - made sure I can execute them from rc2.d etc. The permissions are the same on both servers. They're also running in the same order as on the primary server Yet on reboot they don't start. Any ideas? The offenders are these: jetty 0:off 1:off 2:on 3:on 4:on 5:on 6:off smart 0:off 1:off 2:on 3:on 4:on 5:on 6:off /etc/init.d: -rwxr-xr-x. 1 root root 14456 Mar 13 20:21 jetty -rwxrwxrwx. 1 root root 5829 Mar 29 09:58 smart /etc/rc.d/rc3.d lrwxrwxrwx. 1 root root 15 Mar 29 19:21 S99jetty -> ../init.d/jetty lrwxrwxrwx. 1 root root 11 Mar 26 17:12 S99local -> ../rc.local lrwxrwxrwx. 1 root root 15 Mar 29 19:21 S99smart -> ../init.d/smart I've checked, and I'm in run level 3. I've checked their logs, and there's no indication that that they've been started. I can start them manually easily - and other services are starting normally. I'm completely out of ideas really.

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• Apache2 doesn't serve PHP-scripts correctly [closed]

  - by cmbrnt

  I've run into a problem with my Apache 2.2.16 configuration, running on Debian Squeeze. The problem is that it stopped serving PHP5-scripts completely. When I try to access the sites with Google Chrome, it instead downloads a file called "download", which contains the contents of the script. This is of course not a good thing. It does serve common html-files perfectly... I've been at this for quite a while now, and after all the googling and troubleshooting, I thought it would be a good time to ask you guys. Here's what I've got: The php5 and libapache2-mod-php5 packages are installed /etc/apache2/mods-available contains both php5.load and php5.conf, and these are symlinked from the mods-enabled directory The /etc/php5/ directory is left untouched since the installation. Here's the contents of /etc/apache2/mods-available/php.load: LoadModule php5_module /usr/lib/apache2/modules/libphp5.so And /etc/apache2/mods-available/php.conf: <IfModule mod_php5.c> <FilesMatch "\.ph(p3?|tml)$"> SetHandler application/x-httpd-php </FilesMatch> <FilesMatch "\.phps$"> SetHandler application/x-httpd-php-source </FilesMatch> <IfModule mod_userdir.c> <Directory /home/*/public_html> php_admin_value engine Off </Directory> </IfModule> </IfModule> What am I missing? This is a server with modified virtual hosts and the like, so I might have changed some settings which causes this problem, but simply purging and reinstalling is not an option so far, since the configuration is quite extensive. Any help would be great. Thanks.

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• What are the reasons to use dos batch programs in Windows?

  - by DVK

  Question What would be a good (ideally, technical) reason to ever program some non-trivial task in dos batch language on a modern Windows system as opposed to downloading either PowerShell, or ActiveState Perl? To be more specific, I make the following two assumptions for the duration of this question: anyone technical enough to be able to write a medium-complexity batch script is technical enough to install either of the scripting interpreters. Neither of those two present enough of a learning curve for basic batch replacement tasks that said curve would outweigh the pain of doing any remotely-non-trivial task in batch. Notes "You need a batch program for autoexec.bat" is not a valid reason. Your autoexec.bat may consist of simply calling non-batch script. If you disagree with either of my 2 assumptions above, that's fine, and I may be wrong. But my question is specifically "assuming those 2 assumptions are correct, what would be the reason to still stick with batch?" If it makes it easier to suspend disbelief (in case you disagree with me), add in a 3rd assumption that the question is limited to people who already posess at least some modicum of PowerShell or Perl experience. To re-iterate - this is not meant to be a subjective question about how easy it is to learn PSh or ASPerl compared to doing advanced batch coding. That is a separate question that is too subjective to be bothered with in this post. Background: I used to do some fairly complicated batch programming back in the elder days, and remember batch as one of the worst possble programming languages I had encountered. The idea for this question came after seeing a bunch of batch questions on SO, and trying to grok the answer of one of them out of sheer curiosity and giving up in pain after a minute, exclaiming mentally "why would anyone go through this pain instead of doing that in 1 line of Perl?" :) My own plausible answer I assume there may be an an likely DOS-compatible system, which has DOS interpreter but has no compatible PowerShell or Perl... I'm not aware of one but not completely impossible.

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• Bypassing confirmation prompt of an external process

  - by Alidad

  How can I convert this Perl code to Groovy? How to bypass confirmation prompts of an external process? I am trying to convert a Perl script to Groovy. The program is loading/delete maestro (job scheduling) jobs automatically. The problem is the delete command will prompt for confirmation (Y/N) on every single job that it finds. I tried the process execute in groovy but will stop at the prompts. The Perl script is writing bunch of Ys to the stream and print it to the handler( if I understood it correctly) to avoid stopping. I am wondering how to do the same thing in Groovy ? Or any other approach to execute a command and somehow write Y on every confirmation prompt. Perl Script: $maestrostring=""; while ($x < 1500) { $maestrostring .= "y\n"; $x++; } # delete the jobs open(MAESTRO_CMD, "|ssh mserver /bin/composer delete job=pserver#APPA@") print MAESTRO_CMD $maestrostring; close(MAESTRO_CMD); This is my groovy code so far: def deleteMaestroJobs (){ ... def commandSched ="ssh $maestro_server /bin/composer delete sched=$primary_server#$app_acronym$app_level@" def commandJobs ="ssh $maestro_server /bin/composer delete job=$primary_server#$app_acronym$app_level@" try { executeCommand commandJobs } catch (Exception ex ){ throw new Exception("Error executing the Maestro Composer [DELETE]") } try { executeCommand commandSched } catch (Exception ex ){ throw new Exception("Error executing the Maestro Composer [DELETE]") } } def executeCommand(command){ def process = command.execute() process.withWriter { writer -> 1500.times {writer.println 'Y' } } process.consumeProcessOutput(System.out, System.err) process.waitFor() }

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• making arrays from tab-delimited text file column

  - by absolutenewbie

  I was wondering if anyone could help a desperate newbie with perl with the following question. I've been trying all day but with my perl book at work, I can't seem to anything relevant in google...or maybe am genuinely stupid with this. I have a file that looks something like the following: Bob April Bob April Bob March Mary August Robin December Robin April The output file I'm after is: Bob April April March Mary August Robin December April So that it lists each month in the order that it appears for each person. I tried making it into a hash but of course it wouldn't let me have duplicates so I thought I would like to have arrays for each name (in this example, Bob, Mary and Robin). I'm afraid to upload the code I've been trying to tweak because I know it'll be horribly wrong. I think I need to define(?) the array. Would this be correct? Any help would be greatly appreciated and I promise I will be studying more about perl in the meantime. Thank you for your time, patience and help. #!/usr/bin/perl -w while (<>) { chomp; if (defined $old_name) { $name=$1; $month=$2; if ($name eq $old_name) { $array{$month}++; } else { print "$old_name"; foreach (@array) { push (@array, $month); print "\t@array"; } print "\n"; @array=(); $array{$month}++; } } else { $name=$1; $month=$2; $array{month}++; } $old_name=$name; } print "$old_name"; foreach (@array) { push (@array, $month); print "\t@array"; } print "\n";

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• How can a SVN::Error callback identify the context from which it was called

  - by Colin Fine

  I've written some fairly extensive Perl modules and scripts using the Perl bindings SVN::Client etc. Since the calls to SVN::Client are all deep in a module, I have overridden the default error handling. So far I have done so by setting $SVN::Error::handler = undef as described in [1], but this makes the individual calls a bit messy because you have to remember to make each call to SVN::Client in list context and test the first value for errors. I would like to switch to using an error handler I would write; but $SVN::Error::handler is global, so I can't see any way that my callback can determine where the error came from, and what object to set an error code in. I wondered if I could use a pool for this purpose: so far I have ignored pools as irrelevant to working in Perl, but if I call a SVN::Client method with a pool I have created, will any SVN::Error object be created in the same pool? Has anybody any knowledge or experience which bears on this? [1]: http://search.cpan.org/~mschwern/Alien-SVN-1.4.6.0/src/subversion/subversion/bindings/swig/perl/native/Core.pm#svn_error_t_-_SVN::Error SVN::Core POD

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• When would I use "scripts" or "scripting" in a game, as opposed to the core language?

  - by Brian Reindel

  The terms scripts and scripting appear to be used interchangeably on the Game Development Stack Exchange, but other than reading questions about a scripting language choice, I don't understand the relationship between scripts and scripting, and the core language. What does a script typically do, when would it be used, and are scripts in some contexts (as defined by game programmers) different than a scripting language?

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• La FAQ Perl/Tk, 80 réponses à vos questions dont 13 mises à jour, avec un moteur de recherche intégré

  Salut,Comme on peut le constater, Perl manque malheureusement de cours sur le net en rapport avec la création d'interfaces graphique via Tk. Il existe néanmoins quelques cours sur developpez.com dans la partie coursNoter qu'il est vraiment possible de créer très facilement de très bonnes interfaces graphiques en Perl, et je souhaite d'ailleurs créer une FAQ pour l'occasion, mais je voudrais d'abord connaitre l'avis des Perlistes du forum.Maintenant que la FAQ Perl/Tk est présente, n'hésitez pas à faire des suggestions de questions que vous souhaitez voir pouvant aider les perléens.Vous pouvez tous participer à son évolution.Merci...

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• Can a GPO Startup Script starts a background process and exit immediately?

  - by pepoluan

  I have Googled, and not yet found an answer. Scenario: One of my GPOs have a Startup Script that takes a long time to finish. For some reasons, we have to run the scripts synchronously. Naturally, this causes slow startup time (sometimes as long as 15 minutes!) before the Logon screen appears. After profiling and analyzing the perpetrator script, I conclusively determined that the step where it's taking a long time to finish will not affect the result of the succesive GPOs. In other words, that particular step (and all steps afterwards) can run in the background. My Question: Is it possible for the Startup Script to just 'trigger' another script/program that will run to completion even when the Startup Script exits? That is, the "child processes" of the Startup Script continues to live even when the Startup Script's process ends? Additional Info: The Domain Controllers are 2008 and 2008 R2's. The workstations are Windows XP.

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• Perl fête ses 25 ans, que pensez-vous de l'évolution du langage de programmation ?

  Perl fête ses 25 ans que pensez-vous de l'évolution du langage ? Perl (Practical Extraction and Report Language) a un quart de siècle cette semaine. Le langage de programmation dérivé des langages de scripts shell, sed, awk et du langage C avait été lancé en version 1.0 le 18 décembre 1987 par Larry Wall. Le langage avait été présenté comme une alternative aux utilitaires de traitement de texte Unix Sed et Awk. C'est un an plus tard après la sortie de la version 2.0 que Perl va réellement décoller. En 2000, Perl sort en version 6 et est entièrement réécrit à partir de zéro, tout en concevant ses principes de base. Le langage interprété est surtout apprécié...

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• Running CGI With Perl under Apache Permission Problem

  - by neversaint

  I have the following entry under apache2.conf in my Debian box. AddHandler cgi-script .cgi .pl Options +ExecCGI ScriptAlias /cgi-bin/ /var/www/mychosendir/cgi-bin/ <Directory /var/www/mychosendir/cgi-bin> Options +ExecCGI -Indexes allow from all </Directory> Then I have a perl cgi script stored under these directories and permissions: nvs@somename:/var/www/mychosendir$ ls -lhR .: total 12K drwxr-xr-x 2 nvs nvs 4.0K 2010-04-21 13:42 cgi-bin ./cgi-bin: total 4.0K -rwxr-xr-x 1 nvs nvs 90 2010-04-21 13:40 test.cgi However when I tried to access it in the web browser: http://myhost.com/mychosendir/cgi-bin/test.cgi They gave me this error: [Wed Apr 21 15:26:09 2010] [error] [client 150.82.219.158] (8)Exec format error: exec of '/var/www/mychosendir/cgi-bin/test.cgi' failed [Wed Apr 21 15:26:09 2010] [error] [client 150.82.219.158] Premature end of script headers: test.cgi What's wrong with it? Update: I also have the following entry in my apache2.conf: <Files ~ "^\.ht"> Order allow,deny Deny from all </Files> And the content of test.cgi is this: #!/usr/bin/perl -wT print "Content-type: text/html\n\n"; print "Hello, world!\n";

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• Running CGI With Perl under Apache Permission Problem

  - by neversaint

  I have the following entry under apache2.conf in my Debian box. AddHandler cgi-script .cgi .pl Options +ExecCGI ScriptAlias /mychosendir/cgi-bin/ /var/www/mychosendir/cgi-bin/ <Directory /var/www/mychosendir/cgi-bin> Options +ExecCGI -Indexes allow from all </Directory> Then I have a perl cgi script stored under these directories and permissions: nvs@somename:/var/www/mychosendir$ ls -lhR .: total 12K drwxr-xr-x 2 nvs nvs 4.0K 2010-04-21 13:42 cgi-bin ./cgi-bin: total 4.0K -rwxr-xr-x 1 nvs nvs 90 2010-04-21 13:40 test.cgi However when I tried to access it in the web browser: http://myhost.com/mychosendir/cgi-bin/test.cgi They gave me this error: [Wed Apr 21 15:26:09 2010] [error] [client 150.82.219.158] (8)Exec format error: exec of '/var/www/mychosendir/cgi-bin/test.cgi' failed [Wed Apr 21 15:26:09 2010] [error] [client 150.82.219.158] Premature end of script headers: test.cgi What's wrong with it? Update: I also have the following entry in my apache2.conf: <Files ~ "^\.ht"> Order allow,deny Deny from all </Files> And the content of test.cgi is this: #!/usr/bin/perl -wT print "Content-type: text/html\n\n"; print "Hello, world!\n";

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• How do I increase the buffer size for domain sockets in OS X 10.6

  - by Chas. Owens

  In Linux I have no problem dumping tons of data into a domain socket, but the same code on OS X 10.6.2 blows up after about 65 records. The socket reader code looks like #!/usr/bin/perl use strict; use warnings; use IO::Socket; unlink "foo"; my $sock = IO::Socket::UNIX->new ( Local => 'foo', Type => SOCK_DGRAM, Timeout => 600, ) or die "Could not create socket: $!\n"; while (<$sock>) { chomp; print "[$_]\n"; } And the client code looks like #!/usr/bin/perl use strict; use warnings; use IO::Socket; my $sock = IO::Socket::UNIX->new ( Peer => 'foo', Type => SOCK_DGRAM, Timeout => 600, ) or die "Could not create socket: $!\n"; for my $i (1 .. 1_000_000) { print $sock "$i\n" or die $!; } close $sock; The error message I get is No buffer space available at write.pl line 15.. It seems fairly obvious that there is a difference in the buffer size between Linux and OS X, but I don't know how to set it OS X (or what the possible negative side effects might be).

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• Estimating compressed file size using a list parameter

  - by Sai

  I am currently compressing a list of files from a directory in the following format: tar -cvjf test_1.tar.gz -T test_1.lst --no-recursion The above command will compress only those files mentioned in the list. I am doing this because this list is generated such that it fits a DVD. However, during compression the compression rate decreases the estimated file size and there is abundant space left in the DVD. This is something like a Knapsack algorithm. I would like to estimate the compressed file size and add some more files to the list. I found that it is possible to estimate file size using the following command: tar -cjf - Folder/ | wc -c This command does not take a list parameter. Is there a way to estimate compressed file size? I am also looking into options like perl scripts etc. Edit: I think I should provide more information since I have been doing a lot of web search. I came across a perl script(Link)that sort of emulates the Knapsack algorithm. The current problem with the above mentioned script is that it splits the files in their original state. When I compress the files after splitting them, there are opportunities for adding more files which I consider to be inefficient. There are 2 ways I could resolve the inefficiency: a) Compress individual files and save them in a directory using a script. The compressed file could provide a best estimate. I could generate a script using a folder of compressed files and use them on the uncompressed ones. b) Check whether the compressed file's size is less than the required size. If so, I should keep adding files until I meet the requirement. However, the addition of new files to the compressed file is an optimization problem by itself.

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• How do I increase the buffer size for domain sockets in OS X 10.6

  - by Chas. Owens

  In Linux I have no problem dumping tons of data into a domain socket, but the same code on OS X 10.6.2 blows up after about 65 records. The socket reader code looks like #!/usr/bin/perl use strict; use warnings; use IO::Socket; unlink "foo"; my $sock = IO::Socket::UNIX->new ( Local => 'foo', Type => SOCK_DGRAM, Timeout => 600, ) or die "Could not create socket: $!\n"; while (<$sock>) { chomp; print "[$_]\n"; } And the client code looks like #!/usr/bin/perl use strict; use warnings; use IO::Socket; my $sock = IO::Socket::UNIX->new ( Peer => 'foo', Type => SOCK_DGRAM, Timeout => 600, ) or die "Could not create socket: $!\n"; for my $i (1 .. 1_000_000) { print $sock "$i\n" or die $!; } close $sock; The error message I get is No buffer space available at write.pl line 15.. It seems fairly obvious that there is a difference in the buffer size between Linux and OS X, but I don't know how to set it OS X (or what the possible negative side effects might be).

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• What may be wrong with String::ToIdentifier::EN tests?

  - by wk01

  I try to install Perl module String::ToIdentifier::EN (as depndency of DBIx::Class::Schema::Loader) but it fails on tests. I googled those errors but get no picture, where is problem: Building and testing String-ToIdentifier-EN-0.07 cp lib/String/ToIdentifier/EN.pm blib/lib/String/ToIdentifier/EN.pm cp lib/String/ToIdentifier/EN/Unicode.pm blib/lib/String/ToIdentifier/EN/Unicode.pm Manifying blib/man3/String::ToIdentifier::EN.3pm Manifying blib/man3/String::ToIdentifier::EN::Unicode.3pm PERL_DL_NONLAZY=1 /usr/bin/perl "-MExtUtils::Command::MM" "-e" "test_harness(0, 'inc', 'blib/lib', 'blib/arch')" t/00_basic.t t/10_ascii.t t/20_capitalization.t Byte order is not compatible at ../../lib/Storable.pm (autosplit into ../../lib/auto/Storable/_retrieve.al) line 380, at /home/wanradt/perl5/lib/perl5/Lingua/EN/Tagger.pm line 167 # Looks like you planned 25 tests but ran 4. # Looks like your test exited with 25 just after 4. t/00_basic.t ........... Dubious, test returned 25 (wstat 6400, 0x1900) Failed 21/25 subtests Byte order is not compatible at ../../lib/Storable.pm (autosplit into ../../lib/auto/Storable/_retrieve.al) line 380, at /home/wanradt/perl5/lib/perl5/Lingua/EN/Tagger.pm line 167 # Looks like you planned 768 tests but ran 512. # Looks like your test exited with 25 just after 512. t/10_ascii.t ........... Dubious, test returned 25 (wstat 6400, 0x1900) Failed 256/768 subtests t/20_capitalization.t .. ok Test Summary Report ------------------- t/00_basic.t (Wstat: 6400 Tests: 4 Failed: 0) Non-zero exit status: 25 Parse errors: Bad plan. You planned 25 tests but ran 4. t/10_ascii.t (Wstat: 6400 Tests: 512 Failed: 0) Non-zero exit status: 25 Parse errors: Bad plan. You planned 768 tests but ran 512. Files=3, Tests=528, 1 wallclock secs ( 0.07 usr 0.02 sys + 0.42 cusr 0.04 csys = 0.55 CPU) Result: FAIL Failed 2/3 test programs. 0/528 subtests failed. make: *** [test_dynamic] Error 255 -> FAIL Installing String::ToIdentifier::EN failed. See /home/wanradt/.cpanm/build.log for details. Byte order is not compatible at... seems a key, but to where?

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• Generating SQL change scripts in SSMS 2008

  - by Munish Goyal

  I have gone through many related SO threads and got some basic info. Already generated DB diagram. After that i am unable to find a button/option to generate SQL scripts (create) for all the tables in diagram. "Generate script" button is disabled, even on clicking the table in diagram. However i enabled the auto-generate option in tools-designer. But what to do with previous diagrams. I just want an easy way to auto-generate such scripts (create/alter) and would be gud if i get auto-generated stored procs for insert/selects/update etc. EDIT: I could do generate scripts for DB objects. Now: 1. How to import DB diagram from another DB. 2. How to generate (and manage their change integrated with VS source control) routine stored-procs like insert, update and select. Ok let me ask another way, can experts guide on the usual flow of creating/altering tables (across releases), creating stored-procs (are stored-procs the best way to go ?) and their change-management using SSMS design tools and minimal effort ?

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• Explanation of the init.d/scripts Fedora

  - by Shahmir Javaid

  Below is a copy of vsftpd, i need some explanations of some of the scripts mentioned below in this script: #!/bin/bash # ### BEGIN INIT INFO # Provides: vsftpd # Required-Start: $local_fs $network $named $remote_fs $syslog # Required-Stop: $local_fs $network $named $remote_fs $syslog # Short-Description: Very Secure Ftp Daemon # Description: vsftpd is a Very Secure FTP daemon. It was written completely from # scratch ### END INIT INFO # vsftpd This shell script takes care of starting and stopping # standalone vsftpd. # # chkconfig: - 60 50 # description: Vsftpd is a ftp daemon, which is the program \ # that answers incoming ftp service requests. # processname: vsftpd # config: /etc/vsftpd/vsftpd.conf # Source function library. . /etc/rc.d/init.d/functions # Source networking configuration. . /etc/sysconfig/network RETVAL=0 prog="vsftpd" start() { # Start daemons. # Check that networking is up. [ ${NETWORKING} = "no" ] && exit 1 [ -x /usr/sbin/vsftpd ] || exit 1 if [ -d /etc/vsftpd ] ; then CONFS=`ls /etc/vsftpd/*.conf 2>/dev/null` [ -z "$CONFS" ] && exit 6 for i in $CONFS; do site=`basename $i .conf` echo -n $"Starting $prog for $site: " daemon /usr/sbin/vsftpd $i RETVAL=$? echo if [ $RETVAL -eq 0 ]; then touch /var/lock/subsys/$prog break else if [ -f /var/lock/subsys/$prog ]; then RETVAL=0 break fi fi done else RETVAL=1 fi return $RETVAL } stop() { # Stop daemons. echo -n $"Shutting down $prog: " killproc $prog RETVAL=$? echo [ $RETVAL -eq 0 ] && rm -f /var/lock/subsys/$prog return $RETVAL } # See how we were called. case "$1" in start) start ;; stop) stop ;; restart|reload) stop start RETVAL=$? ;; condrestart|try-restart|force-reload) if [ -f /var/lock/subsys/$prog ]; then stop start RETVAL=$? fi ;; status) status $prog RETVAL=$? ;; *) echo $"Usage: $0 {start|stop|restart|try-restart|force-reload|status}" exit 1 esac exit $RETVAL Question I What the hell is the difference between the && and || signs in the below commands, and is it just an easy way to do a simple if check or is it completely different to a if[..something..]; then ..something.. fi: # Check that networking is up. [ ${NETWORKING} = "no" ] && exit 1 [ -x /usr/sbin/vsftpd ] || exit 1 Question II i get what -eq and -gt is (equal to, greater than) but is there a simple website that explains what -x, -d and -f are? Any help would be apreciated Running Fedora 12 on my OS. Script copied from /etc/init.d/vsftpd Question III It says required starts are $local_fs $network $named $remote_fs $syslog but i cant see any where it checks for those.

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• grep with negative lookbehind

  - by Dan Fabulich

  I'm trying to grep through a bunch of files in nested subdirectories to look for regular expression matches; my regex requires negative lookbehind. Perl has negative lookbehind, but as far as I can tell GNU grep doesn't support negative lookbehinds. What's the easiest way to get an equivalent to GNU grep that supports negative lookbehinds? (I guess I could write my own mini-grep in Perl, but that doesn't seem like it should be necessary. My copy of the Perl Cookbook includes source for tcgrep; is that what I should use? If so, where's the latest version? Don't tell me I have to type this entire program!)

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• PHP to C/C++ through CGI script

  - by Peterim

  Hi guys! I realize it's probably something strange, but here is what I have. I have an application (handwriting recognition engine) written in C/C++. This application has Perl wrapper which was made by application's authors using SWIG. My website is written in PHP, so I'm looking for some ways to make PHP work with C/C++ application. The only way I can think of now is to create a CGI script (perl script) which accepts POST request from my website (AJAX request), sends it to the recognition engine through it's Perl wrapper, gets the required data and returns the required data as a response to AJAX request. Do you think it could be done this way? Are there any better solutions? Thank you!

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• Is "map" a loop?

  - by DVK

  While answering this question, I came to realize that I was not sure whether Perl's map can be considered a loop or not? On one hand, it quacks/walks like a loop (does O(n) work, can be easily re-written by an equivalent loop, and sort of fits the common definition = "a sequence of instructions that is continually repeated"). On the other hand, map is not usually listed among Perl's control structures, of which loops are a subset of. E.g. http://en.wikipedia.org/wiki/Perl_control_structures#Loops So, what i'm looking for is a formal reason to be convinced of one side vs. the other. So far, the former (it is a loop) sounds a lot more convincing to me, but I'm bothered by the fact that I never saw "map" mentioned in a list of Perl loops.

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• Is there any use for Bash scripting anymore?

  - by Precision

  I just finished my second year as a university CS student, so my "real-world" knowledge is lacking. I learned Java my first year, continued with Java and picked up C and simple Bash scripting my second. This summer I'm trying to learn Perl (God help me). I've dabbled with Python a bit in the past. My question is, now that we have very readable, very writable scripting languages like Python, Ruby, Perl, etc, why does anyone write Bash scripts? Is there something I'm missing? I know my linux box has perl and python. Are they not ubiquitous enough? Is there really something that's easier to do in Bash than in some other hll?

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• Access to Apache::DBI from DBI

  - by hpavc

  Is it possible to access a Apache::DBI database handle from a perl script (that isn't running under mod_perl). What I am looking for is database pooling for my perl scripts, I have a fair number of database sources (oracle/mysql) and a growing number of scripts. Some ideas like SQLRelay, using Oracle10XE with database links and pooling, and or convert all scripts to SOAP calls, etc are becoming more and more viable. But if there was a mechanism for reusing Apache::DBI I could fight this a bit. I have no non-perl requirements, so we don't have a php/jdbc implementation or similar to deal with. Thanks

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