I use Getop::Long to get the argument.
I've looked at @ARGV, it gives: 
$VAR1 = [ '-type', 'sugar', '-unit', '6' ];

# where

$sometype = 'foo';
$some_unit = 6;

[download]
So as you can see EMAIL option and its value is totally unrecognize here.
My overall construct under 'mycode.pl' looks like this: 
use strict;
use Data::Dumper;        
use Getopt::Long;


print Dumper \@ARGV ;

my $type = 'bar';
my $no_unit   =  1;
my $help = 0;
my $tg_email = '';


if ( @ARGV == 0 ) {
    &usage();
    exit(1);
}
        
my $res = GetOptions ( "type=s"=>\$type,
                       "unit=i"=>\$no_unit,      
                       "email=s"=>\$tg_email,      
                       "help"=>\$help,);         

if ($res) {

     print "$tg_email\n" # show nothing here.

    # and do some other thing
    
}

[download]

In reply to Re^2: Problem passing a string in system function by Anonymous Monk
in thread Problem passing a string in system function by Anonymous Monk

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