LC_ALL=C 加速你的排序

参考链接：how-to-sort-big-files

• So IMO, chances are you always want sort -uwith LC_ALL=C, if you want unique lines. And if you want that resulting list to be sorted in the user's sort order, pipe it to sort again:

LC_ALL=C sort -u | sort

LC_ALL=C sort | LC_ALL=C uniq -c | sort -k2