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#!/bin/bash

:<<!EOF!

Write a bash script to calculate the frequency of each word in a text file words.txt.

For simplicity sake, you may assume:

words.txt contains only lowercase characters and space ' ' characters.

Each word must consist of lowercase characters only.

Words are separated by one or more whitespace characters.

For example, assume that words.txt has the following content:

the day is sunny the the

the sunny is is

Your script should output the following, sorted by descending frequency:

the 4

is 3

sunny 2

day 1

Note:

!EOF!

awk '{for(i=1;i<=NF;i++) a[$i]++} END {for(k in a) print k,a[k]}' words.txt | sort -k2 -nr

:<<!EOF!

注释：

awk文本分析；NF的值是每行的总列数；--k2 表示按照第二列排序 -nr表示按照逆序排列

!EOF!