有没有一种方法可以防止sed添加回车符(^ M)? [英] Is there a way to prevent sed from adding carriage return (^M)?

问题描述

我正在尝试在wordpress php文件中的 define('WP_DEBUG'，false); 之后添加 define('WP_MEMORY_LIMIT'，'96M'); .

I am trying to add define('WP_MEMORY_LIMIT', '96M'); after the define('WP_DEBUG', false); in a wordpress php file.

这是我到目前为止尝试过的:

Here is what I tried so far:

1-

sed -b -i "/'WP_DEBUG', false);/a define('WP_MEMORY_LIMIT', '96M');" $full_path/wp-config.php;

2-

 sed -i "s/'WP_DEBUG', false);/'WP_DEBUG', false);\ndefine('WP_MEMORY_LIMIT', '96M');/" $full_path/wp-config.php;

问题在于，用该回车替换的所有新行都返回char.如何在特定行之后添加新行而没有这个问题?

The problem with that, all the new lines being replaced with this carriage return char. How can I add a new line after a specific line and do not have this issue ?

define('WP_DEBUG', false);^M
define('WP_MEMORY_LIMIT', '96M');

使用sed(GNU sed)4.2.2，Ubuntu 16.04

Using sed (GNU sed) 4.2.2, Ubuntu 16.04

以下是用于澄清问题的屏幕截图:

Here is the screenshots for clarify the issue:

注意:Okey，阅读@anishsane的答案后问题解决了.由于原始文件(来自wordpress.org/latest.zip)具有CRLF(windows)行结尾，因此添加\ n会破坏文件视图.使用"\ r \ n"解决了该问题:

NOTE: Okey, problem is solved after reading @anishsane's answer. Since the original file (from wordpress.org/latest.zip) has CRLF (windows) line endings, adding \n was breaking the file view. Using "\r\n" solved the issue:

sed -i "s/'WP_DEBUG', false);/'WP_DEBUG', false);\r\ndefine('WP_MEMORY_LIMIT', '96M');/" $full_path/wp-config.php;

我不确定为什么要投票.请解释，以便我澄清这个问题.

I am not sure why the downvotes. Please explain, so I can clarify the question.

推荐答案

该文件最初具有CRLF行尾.当您在 vim 编辑器中打开文件时，vim会知道该文件的CRLF结尾是& ;；从用户隐藏.通过编辑器添加的任何新行也将具有与文件其余部分相同的行尾.

The file originally has CRLF line endings. When you open it in vim editor, vim understands that file has CRLF endings & hides them from user. Any new line/s added via the editor will also have the same line endings as the rest of the file.

通过 sed 添加新行时，它的行尾为 LF .下次当您在 vim 中打开它时，vim会看到混合的行尾， CRLF & LF .然后， vim 决定将其解释为具有 LF 行尾的文件.&所有 CR 字符都突出显示为 ^ M .

When you add a new line via sed, it has LF line endings. Next time when you open it in vim, vim sees mixed line endings, CRLF & LF. vim then decides to interpret it as file with LF line endings. & all CR characters are highlighted as ^M.

要测试，请尝试以下操作:

to test, try this:

$ printf '%d\r\n' {1..5} > test_endings # This will create a file with CRLF endings.
$ file test_endings 
test_endings: ASCII text, with CRLF line terminators
$ vim test_endings
1
2
3
4
5
~
~
"test_endings" [dos] 5L, 15C        <~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Notice the word DOS here.

$ echo 6 >> test_endings # This will add line with LF line endings.
$ file test_endings 
test_endings: ASCII text, with CRLF, LF line terminators
$ vim test_endings
1^M
2^M
3^M
4^M
5^M
6
~
~
"test_endings" 6L, 17C

简而言之，问题不在于 sed ，而是原始文件.

In short, the issue is not with sed, it's with the original file.

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