Use open or backticks instead of system . System doesn't capture the output of the command. 
Open :

open ($filehandle ,"/usr/bin/which prg|") or die "Error $!\n";
while(<$filehandle>)
{
...
}

Backticks :

my $output = `/usr/bin/which prg`;
chomp $output;

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In reply to Re: put system(); output into my $variable -- chech for installed aplications by 13warrior
in thread put system(); output into my $variable -- chech for installed aplications by baxy77bax

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