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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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lastlogcommand; this doesn't record all login/logout/reboot stuff thatwtmprecords, but it does record the last login time for each user. Note, though, that in both cases a non-interactive login may not show up (ssh remotehost cat myfiledoesn't necessarily count as a login!)