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Word Frequency LeetCode Solution

Problem – Word Frequency LeetCode Solution

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.


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


  • 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?

Word Frequency LeetCode Solution in Bash

declare -A arr #associative array

while IFS= read -r line
    for word in $line
        let arr[$word]=${arr[$word]}+1
done < words.txt

for key in ${!arr[@]}
    echo $key ${arr[$key]}
done | sort -rn -k2
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