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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
/bin/shdoesn't identify a particular shell. On some systems it points to bash (in a POSIX-compliant mode); on others it may be dash or even the original Bourne shell. All you know is that it's POSIX-compliant; you can't tell what extra features it may support. (Even in POSIX mode, bash supports lots of things that other shells don't. — Which means that running on/bin/shdoesn't prove that your script is POSIX-compliant… Dash is much more suited to that.)