Using DHCP on resnet only gives me search rit.edu as far as search domains. So, I got bored and wrote a small script to add useful domains for me. This is done using a feature of ISC's dhcp program, dhclient, called dhclient-exit-hooks. This is a shell script that is run when dhclient finishes fetching you an IP address.
This will add csh.rit.edu and cs.rit.edu to the search line in my /etc/resolv.conf.
Requires: a version of sed that supports inline editing (the -i option)

#!/bin/sh

DOMAINS="csh.rit.edu cs.rit.edu"

for dom in $DOMAINS; do
        grep "^search.*\b$dom\b" /etc/resolv.conf > /dev/null 2>&1 || 
        sed -i -e "/^search/ s/$/ $dom/" /etc/resolv.conf
done

I was curious to see how much slower sprintf was in perl than an equivalent print statement. Using Debug::Profile hotness, after a million calls it turns out that sprintf is insignificantly slower. Yay boredom.

time elapsed (wall):   47.2054
time running program:  34.0098  (72.05%)
time profiling (est.): 13.1956  (27.95%)
number of calls:       2000000

%Time    Sec.     #calls   sec/call  F  name
60.20   20.4722        0  20.472220  *  
21.04    7.1548  1000000   0.000007     main::sp
18.77    6.3828  1000000   0.000006     main::nosp

sub sp {
   return sprintf("(%s) %s - %s\n", $album, $artist, $title);
}

sub nosp {
   return "(" . $album . ") " . $artist . " - " . $title . "\n";
}