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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)
``` - put returns between paragraphs
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lang-bash
export PEM_FILE=~/.ssh/xxx.pem(orPEM=$HOME/.ssh/xxx.pem; export PEM, which will work in all bourne-like shells). No, the quotes aren't needed withexport PEM=.... But they are needed withchmod 400 "$PEM_FILE".