如何创建文件中每个单词的频率列表? [英] How to create a frequency list of every word in a file?

问题描述

我有一个这样的文件:

This is a file with many words.
Some of the words appear more than once.
Some of the words only appear one time.

我想生成一个两列列表.第一列显示哪些词出现，第二列显示它们出现的频率，例如:

I would like to generate a two-column list. The first column shows what words appear, the second column shows how often they appear, for example:

this@1
is@1
a@1
file@1
with@1
many@1
words3
some@2
of@2
the@2
only@1
appear@2
more@1
than@1
one@1
once@1
time@1 

• 为了使这项工作更简单，在处理列表之前，我将删除所有标点符号，并将所有文本更改为小写字母.
• 除非有一个简单的解决方案，words 和 word 可以算作两个单独的词.
• To make this work simpler, prior to processing the list, I will remove all punctuation, and change all text to lowercase letters.
• Unless there is a simple solution around it, words and word can count as two separate words.

到目前为止，我有这个:

So far, I have this:

sed -i "s/ /
/g" ./file1.txt # put all words on a new line
while read line
do
     count="$(grep -c $line file1.txt)"
     echo $line"@"$count >> file2.txt # add word and frequency to file
done < ./file1.txt
sort -u -d # remove duplicate lines

出于某种原因，这只是在每个单词后显示0".

For some reason, this is only showing "0" after each word.

如何生成文件中出现的每个单词的列表以及频率信息?

How can I generate a list of every word that appears in a file, along with frequency information?

推荐答案

不是 sed 和 grep，而是 tr, sort、uniq 和 awk:

Not sed and grep, but tr, sort, uniq, and awk:

% (tr ' ' '
' | sort | uniq -c | awk '{print $2"@"$1}') <<EOF
This is a file with many words.
Some of the words appear more than once.
Some of the words only appear one time.
EOF

a@1
appear@2
file@1
is@1
many@1
more@1
of@2
once.@1
one@1
only@1
Some@2
than@1
the@2
This@1
time.@1
with@1
words@2
words.@1

在大多数情况下，您还想删除数字和标点符号，将所有内容都转换为小写(否则THE"、The"和the"将单独计算)并禁止输入零长度单词.对于 ASCII 文本，您可以使用此修改后的命令执行所有这些操作:

In most cases you also want to remove numbers and punctuation, convert everything to lowercase (otherwise "THE", "The" and "the" are counted separately) and suppress an entry for a zero length word. For ASCII text you can do all these with this modified command:

sed -e  's/[^A-Za-z]/ /g' text.txt | tr 'A-Z' 'a-z' | tr ' ' '
' | grep -v '^$'| sort | uniq -c | sort -rn

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