For those of you too lazy to figure out what trak3r wrote, here is that writeup after going through ROT13:

ROT13 is a super lame encryption technique that consists of shifting each letter of the alphabet thirteen places. (uvag: guvf nccneragyl-tneoyrq fragrapr vf EBG13 rapbqrq)

For those people who don't have access to tr but have access to perl and the command line, here is a short little Perl program:

while(<>) {                   #for each line of data ...
    tr/a-zA-Z/n-za-mN-ZA-M/;  #... perform ROT-13 ...
    print;                    #... and display the translated line

dafydd, being a real Perl programmer, determined how to make the program a one-liner:

    tr/a-zA-Z/n-za-mN-ZA-M/ and print while <>

If you can't even do that, but have access to the site Everything 2 (probably a safe bet), JayBonci wrote E2 Rot13 Encoder, which lets E2 do all the work..