如何将多行输出连接到一行？ [英] How to concatenate multiple lines of output to one line?

问题描述

如果我运行命令 cat file | grep模式，我得到很多输出行。如何将所有行连接成一行，并用\来有效地替换每个\\\
（以后跟空格结束）？

cat file | grep模式| xargs sed s / \ n / / g
不适合我。

解决方案

使用 tr'\ n'''将所有换行符转换为空格：

  $ grep模式文件| tr'\\\
'''
  

注意： grep 读取文件， cat 连接文件。不要 cat文件| grep ！

编辑：
$ b

tr 只能处理单个字符的翻译。您可以使用 awk 更改输出记录分隔符，如：

  $ grep模式文件| awk'{print}'ORS =''
  

这会转变：

  one 
 two 
 three 
  

到：

 一个两三
  

If I run the command cat file | grep pattern, I get many lines of output. How do you concatenate all lines into one line, effectively replacing each "\n" with "\" " (end with " followed by space)?

cat file | grep pattern | xargs sed s/\n/ /g isn't working for me.

解决方案

Use tr '\n' ' ' to translate all newline characters to spaces:

$ grep pattern file | tr '\n' ' '

Note: grep reads files, cat concatenates files. Don't cat file | grep!

Edit:

tr can only handle single character translations. You could use awk to change the output record separator like:

$ grep pattern file | awk '{print}' ORS='" '

This would transform:

one
two 
three

to:

one" two" three" 

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