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I made an update but still not working correctly in Ubuntu 12.04.. :( It looks like the line number part is not working correctly
– Binod Kalathil
Commented Apr 13, 2016 at 9:23
I rejected Binod's suggested edit as it's not a logical error. Ghassan's original code uses the same approach as Barmar's answer – which works. The comments to Barmar's answer explain why the suggestion of replacing 1800 with $line deletes every other line and then exceeds the desired range.
– Anthony Geoghegan
Commented Apr 13, 2016 at 9:37

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create code fences with backticks ` or tildes ~
```
like so
```
add language identifier to highlight code
```python
def function(foo):
print(foo)
```
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for linebreak add 2 spaces at end
_italic_ or **bold**
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quote by placing > at start of line
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