使用sed从传入流中删除换行符 [英] removing new line character from incoming stream using sed

问题描述

我是Shell脚本的新手，我正在尝试使用SED从每一行中删除新行字符。这是我到目前为止所做的：

I am new to shell scripting and i am trying to remove new line character from each line using SED. this is what i have done so far :

printf "{new\nto\nlinux}" | sed ':a;N;s/\n/ /g'

仅删除Ist新行字符。
我在某处找到了此命令：

removes only Ist new line character. I somewhere found this command :

printf "{new\nto\nlinux}" | sed ':a;N;$!ba;s/\n/ /g'

但是它给出了： ba：未找到事件。

but it gives :"ba: Event not found."

如果我这样做：

printf "{new\nto\nlinux}" | sed ':a;N;s/\n/ /g' | sed ':a;N;s/\n/ /g'

然后给出正确的输出但是我正在寻找更好的东西，因为我不确定运行脚本时会得到多少个新字符。
传入流来自echo或printf或脚本中的某些变量。
预先感谢

then it gives correct output but i am looking for something better as i am not sure how many new character i will get when i run the script. incoming stream is from echo or printf or some variable in script. Thanks in advance

推荐答案

要删除换行符，请使用tr：

To remove newlines, use tr:

tr -d '\n'

如果要用单个空格替换每个换行符：

If you want to replace each newline with a single space:

tr '\n' ' '

错误 ba：未找到事件来自csh，并且是由于csh尝试匹配历史记录列表中的！ba 。您可以转义！并编写命令：

The error ba: Event not found is coming from csh, and is due to csh trying to match !ba in your history list. You can escape the ! and write the command:

sed ':a;N;$\!ba;s/\n/ /g'  # Suitable for csh only!!

但是sed是错误的工具，最好使用处理引号的外壳字符串更合理。也就是说，停止使用csh并开始使用bash。

but sed is the wrong tool for this, and you would be better off using a shell that handles quoted strings more reasonably. That is, stop using csh and start using bash.

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