BiruLyu · June 3, 2017 23:31
diff --git a/192. Word Frequency.bash b/192. Word Frequency.bash
 # Read from the file words.txt and output the word frequency list to stdout.

 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 https://linux.cn/article-3945-1.html.
	# Read from the file words.txt and output the word frequency list to stdout.

	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 https://linux.cn/article-3945-1.html.