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marto's scratchpad

by marto (Bishop)
on Jun 02, 2004 at 07:58 UTC ( #359256=scratchpad: print w/ replies, xml ) Need Help??

For Trace On, a short example, it may not be ideal for your unspecified usage case, but perhaps enough to get you going. If this isn't what you're looking for, it's been a long night. Feel free to post in SoPW:

#!/usr/bin/perl use strict; use warnings; # made up data, name/age my %Beatles = ("John", 31, "Paul", 31, "George", 25, "Ringo", 29); # find all matching keys with the value 31 my @matching_ages = grep { $Beatles{$_} eq '31' } keys %Beatles; print ("$_ \n") foreach @matching_ages;

For To_bz:

#!/usr/bin/perl use strict; use warnings; # here you assign the value "index_out" to $Index_File_Name my $Index_File_Name = "index_out"; warn "Index_File_Name: $Index_File_Name"; # here you assign an undefined value to $Index_File_name # it no longer contains what you think it does. $Index_File_Name = shift; warn "Index_File_Name: $Index_File_Name";

Just get rid of the line $Index_File_Name = shift;. See shift or if you want to have a default output file name if the user does not specify one via the command prompt:

#!/usr/bin/perl use strict; use warnings; my $Index_File_Name = shift || "index_out"; warn "Index_File_Name: $Index_File_Name";

If you run this code the first argument will be the file name, if none is provide "index_out" will be the file name.

I've sent a pull request on github to improve the error message returned. On this site we use code tags when posting so that code and data are readable:

<code> Your code goes here </code>

The following are worth reading: PerlMonks for the Absolute Beginner, How do I post a question effectively?.

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