#!/usr/bin/env perl
use strict; use warnings;

@all = ("7723","7725","9908","7765","7874");

while( <DATA> ) {
    my @column = split /\s+/;  #get columns out of data line
    for my $x (@all) {
      next unless $x == $column[1]; # compare second column, move on if no match
      print $_;  # we found a match, print out the original line
      last;      # we're done, so stop comparing this line
    }
}

__DATA__
77876    8543    CA84985    54E
77873    8003    CA84985    54E
77875    7725    CA84985    54E
77872    8511    CA84985    54E
77873    8123    CA84985    54E
77822    9908    CA84985    54E
77819    8503    CA84985    54E
77826    8040    CA84985    54E
77822    7874    CA84985    54E
77884    8543    CA84985    54E
77809    7211    CA84985    54E

##</code><code>##

#!/usr/bin/env perl
use strict; use warnings;

@all = ("7723","7725","9908","7765","7874");

# partial application of the Schwartzian Transform
# each unique value in @all will now be a key in the %all hash
my %all = map { $_ => 1 } @all;

while( <DATA> ) {
    my @column = split /\s+/;     #get columns out of data line
    print $_ if $all{$column[1]};
}

__DATA__
77876    8543    CA84985    54E
77873    8003    CA84985    54E
77875    7725    CA84985    54E
77872    8511    CA84985    54E
77873    8123    CA84985    54E
77822    9908    CA84985    54E
77819    8503    CA84985    54E
77826    8040    CA84985    54E
77822    7874    CA84985    54E
77884    8543    CA84985    54E
77809    7211    CA84985    54E