1. Using system and backticks might be a security risk if user input is part of the executed command. Tainting and proper validation of user input should be employed to mitigate the risk. In many other situations, it might be just sloppy and slow, as starting a new shell usually takes a lot more than doing the same steps in the already running Perl interpreter. Getting an HTTP header from a remote server and searching for a given detail is easy in Perl. There are still tools that don't have Perl interface, for them using system or backticks is the only way to go.

  2. #!/usr/bin/perl
use warnings;
use strict;
use feature qw{ say };

use LWP::UserAgent;

my $url = 'http://wordpress.org/latest';

my $ua = 'LWP::UserAgent'->new;

if (my $header = $ua->head($url)) {
    my ($version)
        = $header->header('Content-Disposition') =~ /(\d+\.\d+(?:\.\d+
+)?)/;
    say $version;

} else {
    die "Can't retrieve the header from '$url'.\n";
}

    [download]

($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,

[download]

In reply to Re: curl without backticks and system() by choroba
in thread curl without backticks and system() by urbansumo

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