0192. Word Frequency

https://leetcode.com/problems/word-frequency

Description

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.

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:

• Don't worry about handling ties, it is guaranteed that each word's frequency count is unique.

• Could you write it in one-line using Unix pipes?

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