使用 xsel 将多行合并为一行答案

【问题标题】：merge multiple lines into a single line using xsel使用 xsel 将多行合并为一行
【发布时间】：2022-01-08 08:58:52
【问题描述】：

我想突出显示一个段落，然后执行xsel。很多时候，xsel 会输出多行

$ xsel
The TCP/IP protocol suite is so named for two of its most important protocols: 
Transmission Control Protocol (TCP) and Internet Protocol (IP). A less used 

name for it is the Internet Protocol Suite, which is the phrase used in official 

Internet standards documents. In this book, we use the more common, shorter 

term, TCP/IP, to refer to the entire protocol suite.
\ No newline at end of selection

我想把它变成一行：

$ xsel
The TCP/IP protocol suite is so named for two of its most important protocols: Transmission Control Protocol (TCP) and Internet Protocol (IP). A less used name for it is the Internet Protocol Suite, which is the phrase used in official Internet standards documents. In this book, we use the more common, shorter term, TCP/IP, to refer to the entire protocol suite.
\ No newline at end of selection

有时，xsel 输出已经是单行。在这种情况下，我输入的将多行转换为单行的任何命令都应该忽略这个罕见的时刻。

【问题讨论】：

标签： awk text sed

【解决方案1】：

您只需将xsel 的输出重定向到tr 之类的实用程序，即可将每个换行符转换为空白。

xsel | tr '\n' ' '

【讨论】：

【解决方案2】：

我会使用 GNU AWK 来完成这个任务，如下所示，让 xsel 输出

The TCP/IP protocol suite is so named for two of its most important protocols: 
Transmission Control Protocol (TCP) and Internet Protocol (IP). A less used 

name for it is the Internet Protocol Suite, which is the phrase used in official 

Internet standards documents. In this book, we use the more common, shorter 

term, TCP/IP, to refer to the entire protocol suite.

然后

xsel | awk 'BEGIN{RS="[[:space:]]*\n+";ORS=" "}{print}'

输出

The TCP/IP protocol suite is so named for two of its most important protocols: Transmission Control Protocol (TCP) and Internet Protocol (IP). A less used name for it is the Internet Protocol Suite, which is the phrase used in official Internet standards documents. In this book, we use the more common, shorter term, TCP/IP, to refer to the entire protocol suite.

说明：我将行分隔符 (RS) 设置为 0 个或多个空格，后跟 1 个或多个换行符，并将输出行分隔符 (ORS) 设置为单个空格。如果行有尾随空格并且行为空白，这将防止出现多个空格。

（在 gawk 4.2.1 中测试）

【讨论】：