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
题目链接:https://leetcode.com/problems/word-frequency/
# Read from the file words.txt and output the word frequency list to stdout.
cat words.txt | tr ' ' '\n' |sort| grep .| uniq -c | sort -r -n -k 1| awk '{print $2,$1}'
或者
# Read from the file words.txt and output the word frequency list to stdout.
awk '{ for (i=1; i<=NF; i++) { ++D[$i]; } } END { for (i in D) { print i, D[i] } } ' words.txt | sort -nr -k 2
或者
# Read from the file words.txt and output the word frequency list to stdout.
tr ' ' '\n' < words.txt | sort | uniq -c | sort -nr | awk 'NF>1{print $2" "$1}'