分析
写bash，不太会啊……
难度 中
来源
https://leetcode.com/problems/word-frequency/
题目
Write a bash script to calculate the frequency of each word in a text file words.txt.
For simplicity sake, you may assume:
words.txtcontains 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
Note:
- 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?
解答
https://leetcode.com/problems/word-frequency/discuss/55443/My-simple-solution-(one-line-with-pipe)
1 cat words.txt | tr -s ' ' 'n' | sort | uniq -c | sort -r | awk '{ print $2, $1 }'
tr -s: truncate the string with target string, but only remaining one instance (e.g. multiple whitespaces)
sort: To make the same string successive so that uniq could count the same string fully and correctly.
uniq -c: uniq is used to filter out the repeated lines which are successive, -c means counting
sort -r: -r means sorting in descending order
awk '{ print $2, $1 }': To format the output, see here.
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