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create code fences with backticks ` or tildes ~
```
like so
``` -
add language identifier to highlight code
```python
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lang-bash
alias r='fc -e -'is a valuable alias to rerun previous commands.fcon its own originated in Korn shell, I believe. You can specify commands by number (fc 123 129to edit command numbers 123 to 129 in the history). You can specify relative numbers (fc -10 -1to edit the last 10 commands entered). You can list previous commands withfc -l. You can specify a command by prefix with theralias (r makeruns the last invocation ofmake; so doesr mif you've not run amvcommand since you last ranmake, etc.).