shell sort

sort is awesome!

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使用空格作为分隔符的一个文本，13万条记录，想要以第一列的值倒序排列：

#-t是分隔符，中间不能有空格
#-k是列，不能有空格，
#1nr，表示第1列以number_sort方式reverse倒序排列
sort -t" " -k1,1nr source.txt>dest.txt

13万记录，3妙搞定！！