shell 词频

摘自《Linux Shell 脚本攻略》一书：

#!/bin/bash#filename : word_freq.shif [ $# -ne 1 ];thenecho "Usage : $0 filename"exit -1fifilename=$1egrep -o "\b[[:alpha:]]+\b" $filename | \awk '{ count[$0]++ }END{ print NR,NFprintf("%-20s%s\n", "Word", "Count") ;for(ind in count){printf("%-20s%d\n", ind, count[ind]); }}'