如何在不区分大小写的明文文件中计算唯一术语？

This can be in any high-level language that is likely to be available on a typical unix-like system (Python, Perl, awk, standard unix utils {sort, uniq}, etc). Hopefully it's fast enough to report the total number of unique terms for a 2MB text file.This can be in any high-level language that is