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There's nothing Vim-specific here. This is fully compliant with POSIX specifications for ex, except that implementations are not required to support multiple -c flags. For definite portability I would use printf '%s\n' 1i '<!DOCTYPE html>' . x | ex file

Wildcard
– Wildcard

2016-10-16 08:31:28 +00:00
Commented Oct 16, 2016 at 8:31

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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

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>

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