使用 Linux 删除少于 4 个字符的单词

Question

我已阅读以下内容并尝试根据我的需要重新设计命令逻辑。 但是，我只是没能把它做好。

在bash中删除长度小于2的单词

试过： echo $example | sed -e 's/ [a-zA-Z0-9]\\{4\\} / /g' echo $example | sed -e 's/ [a-zA-Z0-9]\\{4\\} / /g'

使用 sed 删除所有大于 6 个字符的单词

试过： sed -e s'/[A-Za-z]\\{,4\\}//g'

---

请使用简单的awk或sed命令帮助我执行以下操作：

Here is an example line of fantastic data

并得到：

Here example line fantastic data

Answer 1

$ echo Here is an example line of fantastic data | sed -E 's/\b\(\w\)\{,3\}\b\s*//g'
Here is an example line of fantastic data

Answer 2

如果将句子存储在变量中，则可以在 for 循环中遍历它。 然后您可以评估每个单词是否大于 2 个字符。

sentence="Here is an example line of fantastic data";
for word in $sentence; do
    if [ ${#word} -gt 2]; then
        echo -n $word;
        echo -n " ";
    fi
done

Answer 3

这是一个 BASH 示例，说明如果文件中有很多句子，这是最常见的情况，该怎么做？

SCRIPT（删除两个字母或更短的单词）

#!/bin/bash

while read line
do

    echo "$line" | sed -E 's/\b\w{1,2}\b//g' 

done < <( cat sentences.txt )

输入

$  cat sentences.txt
Edgar Allan Poe (January 19, 1809 to October 7, 1849) was an
American writer, poet, critic and editor best known for evocative
short stories and poems that captured the imagination and interest
of readers around the world. His imaginative storytelling and tales
of mystery and horror gave birth to the modern detective story.

Many of Poe’s works, including “The Tell-Tale Heart” and
“The Fall of the House of Usher,” became literary classics. Some
aspects of Poe’s life, like his literature, is shrouded in mystery,
and the lines between fact and fiction have been blurred substantially
since his death.

输出

$ ./grep_tests.sh
Edgar Allan Poe (January , 1809  October , 1849) was
American writer, poet, critic and editor best known for evocative
short stories and poems that captured the imagination and interest
 readers around the world. His imaginative storytelling and tales
 mystery and horror gave birth  the modern detective story.

Many  Poe’ works, including “The Tell-Tale Heart” and
“The Fall  the House  Usher,” became literary classics. Some
aspects  Poe’ life, like his literature,  shrouded  mystery,
and the lines between fact and fiction have been blurred substantially
since his death.