【leetcode】bash脚本练习

【192】Word Frequency? ?

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
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?

?

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【193】Valid Phone Numbers ? ?

【194】Transpose File? ?

【195】Tenth Line