You are not logged in. Your edit will be placed in a queue until it is peer reviewed.
We welcome edits that make the post easier to understand and more valuable for readers. Because community members review edits, please try to make the post substantially better than how you found it, for example, by fixing grammar or adding additional resources and hyperlinks.
Required fields*
How to Edit
- Correct minor typos or mistakes
- Clarify meaning without changing it
- Add related resources or links
- Always respect the author’s intent
- Don’t use edits to reply to the author
How to Format
-
create code fences with backticks ` or tildes ~
```
like so
``` -
add language identifier to highlight code
```python
def function(foo):
print(foo)
``` - put returns between paragraphs
- for linebreak add 2 spaces at end
- _italic_ or **bold**
- indent code by 4 spaces
- backtick escapes
`like _so_` - quote by placing > at start of line
- to make links (use https whenever possible)
<https://example.com>[example](https://example.com)<a href="https://example.com">example</a>
How to Tag
A tag is a keyword or label that categorizes your question with other, similar questions. Choose one or more (up to 5) tags that will help answerers to find and interpret your question.
- complete the sentence: my question is about...
- use tags that describe things or concepts that are essential, not incidental to your question
- favor using existing popular tags
- read the descriptions that appear below the tag
If your question is primarily about a topic for which you can't find a tag:
- combine multiple words into single-words with hyphens (e.g. shell-script), up to a maximum of 35 characters
- creating new tags is a privilege; if you can't yet create a tag you need, then post this question without it, then ask the community to create it for you
lang-perl
perl -i -0 -pe '$b = `cat before.txt`; $a = `cat after.txt`; s/\Q$b\E/$a/s\' text.txt, but it is still not working correctly. I got it working in one instance by making sure the string in before exactly matches the whole lines in which the strings was to be replaced. But it does not work for instance to replace a string that is not found at the start of the line. Example: text.txt file containing: Here is some text. before.txt contains: text after.txt contains: whatever No chance is made. (New lines are not shown in comments. Moved it to question.)text.\n, while before.txt containstext\n. The other has a dot in before the newline, the other doesn't, so they don't match. You could usechomp $bafter reading into$bto remove a possible trailing newline from it if you don't want to match it. (I only tested with full lines, so I didn't think of that case.)$b = chomp($b), plus variations with backticks and different places of chomp, i.e.chomp($b = `cat before. txt`), but did not manage to get it working.chomp $b, it modifies the variable directly.chomp($b =cat before.txt)seems to work too, it's also mentioned in the docs for chomp.