leetcode192. Word Frequency

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:

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

solution

1、using awk with for

awk '{for(i=1;i<=NF;i++){print $i}}' words.txt  | sort | uniq -c | sort -r | awk '{print $2,$1}'

2、using awk with while

awk '{i=1;while(i<=NF){print $i;i++}}' words.txt | sort | uniq -c | sort -r | awk '{print $2,$1}'