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

my @history = ( "Cache::SizeAwareMemoryCache(3)" , "dhcp-options(5)" , "BN_add_word(3)" , "audit-packages(8)" );
my $choice = "dhcp-options(5)";

@history = grep !/\Q$choice\E/, @history; # '\Q' to quotemeta
push @history, $choice;

print "@history";