Why use ag? * It searches through code about 3x-5x faster than ack. * It ignores files matched by patterns in your .gitignore and .hgignore. * If there are files in your source repo that you don't want to search, just add their patterns to a .agignore file. * It's written in C instead of perl, the lesser of two evils :) * The binary name is 33% shorter than ack!