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

# Author: Huahua
# Running time: 8 ms (beats 99.80%)
cat words.txt | tr -s " " "\n" | sort | uniq -c | sort -r | awk '{print $2, $1}'

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