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THIS is very useful. Not sure if it's exactly the answer the questioner asked, but people should know about it, since it may not be obvious. For example "ssh user@host "export x=5; bash" Then in terminal that pops up echo $x displays 5.
– clearlight
Commented Jul 26, 2019 at 12:00

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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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