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192_word_frequency.sh
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192_word_frequency.sh
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# 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}'
# cat ——浏览文件
# tr -s ——替换字符串(空格换为换行)保证了一行一个单词
# sort ——默认ASCII值排序,排序号后还会有重复
# uniq —— 去重,-c再输出重复次数。结果就是 ”4 abc“ abc出现了4次
# sort -r —— 反向排序,也就是从大到小。得到按频率高低的结果
# awk ——格式化输出,规定输出是先字符串再重复次数,所以先$2再$1,中间空格分隔
# This is my personal record of solving Leetcode Problems.
# If you have any questions, please discuss them in [Issues](https://github.com/mengxinayan/leetcode/issues).
# Copyright (C) 2020-2022 mengxinayan
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.