#!/usr/bin/perl -w
use strict;

sub get_part_num {
  my $part;
  while (!$part || $part =~ /[^0-9]/) {
    print "Part Number? ";
    chomp( $part = <STDIN> );
  }
  return $part;
}

sub search {
  my ($file, $part) = @_;
  open my $db, "<$file" or die "Could not read file: $!";
  while (<$db>) {
    chomp;
    my @fields = split(/\|/, $_);
    print "Part $part found: \n\t",
      join("\n\t", @fields[1..$#fields]), "\n"
        if $fields[0] eq $part;
  }
}

search( 'fai.txt', get_part_num() );