Automatically load module on startup?

adler187 has asked for the wisdom of the Perl Monks concerning the following question:

Replies are listed 'Best First'.
Re: Automatically load module on startup? by moritz (Cardinal) on Mar 09, 2012 at 06:58 UTC
Most modern shells support some kind of aliasing mechanism. For example in bash you can write `alias perl='perl -MCarp::Always' perl yourscript.pl # now with backtraces!` [download] Perl 6 - second systems done right	[reply] [d/l]
Re: Automatically load module on startup? by Anonymous Monk on Mar 09, 2012 at 04:15 UTC
perlrun#PERL5OPT see sitecustomize undef perlrun#* f*	[reply]
Re^2: Automatically load module on startup? by zengargoyle (Deacon) on Mar 09, 2012 at 08:23 UTC
Yay `sitecustomize.pl`, no environment variable tweakage needed. $ cat /var/local/perl/5.14.2/lib/site_perl/5.14.2/sitecustomize.pl package AlwaysRun; use Carp qw(:DEFAULT cluck); cluck "$0 $$: I am begun at " . localtime(); 1; $ perl -E 'say "howdy"' -e 16199: I am begun at Fri Mar 9 00:16:58 2012 at /var/local/perl/5. +14.2/lib/site_perl/5.14.2/sitecustomize.pl line 3. require /var/local/perl/5.14.2/lib/site_perl/5.14.2/sitecustom +ize.pl called at -e line 0 main::BEGIN() called at /var/local/perl/5.14.2/lib/site_perl/5 +.14.2/sitecustomize.pl line 0 eval {...} called at /var/local/perl/5.14.2/lib/site_perl/5.14 +.2/sitecustomize.pl line 0 howdy [download]	[reply] [d/l]
Re^2: Automatically load module on startup? by adler187 (Initiate) on Mar 09, 2012 at 17:07 UTC
Thanks, that is exactly what I needed. I was just looking at that documentation yesterday, but must have glanced over it.	[reply]
Re: Automatically load module on startup? by tchrist (Pilgrim) on Mar 09, 2012 at 05:57 UTC
This is fragile, but you get the idea: `$ cat -n AlwaysRun.pm 1 package AlwaysRun; 2 3 use Carp qw(:DEFAULT cluck); 4 5 cluck "$0 $$: I am begun at " . localtime(); 6 7 1; $ export PERL5OPT=-MAlwaysRun $ perl -E 'say "howdy"' -e 4574: I am begun at Thu Mar 8 22:55:52 2012 at AlwaysRun.pm line 5 require AlwaysRun.pm called at -e line 0 main::BEGIN() called at AlwaysRun.pm line 0 eval {...} called at AlwaysRun.pm line 0 howdy` [download]	[reply] [d/l]
Re: Automatically load module on startup? by bms (Monk) on Mar 09, 2012 at 04:30 UTC
Without knowing your exact requirements, you may want to take a look at the Autoloader module. If you need certain functions available for one one liners from an assortment of modules that you only need a subroutine or two from, AutoLoader may be a good option. Although this is a bit of work, and requires writing .al files. If you're interested in AutoLoader, you may also want to check out this short guide.	[reply]
Re^2: Automatically load module on startup? by chromatic (Archbishop) on Mar 09, 2012 at 05:46 UTC
I haven't used `AutoLoader` in ages. How would you use it to load a module every time someone invokes `perl`?	[reply] [d/l] [select]
Re^3: Automatically load module on startup? by bms (Monk) on Mar 09, 2012 at 05:53 UTC
AutoLoader doesn't load modules. If perl receives an undefined subroutine, it starts looking in the auto directory for it. If it finds the proper .al file, it uses it. Despite AutoLoader not loading full modules, it may be something that the OP may want to look at.	[reply]