LeetCode -

Question Definition

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.

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

Java Solution

cat words.txt | tr -s ' ' '\
' | sort | uniq -c | sort -r | awk '{ print $2, $1 }'