>>cat
^^^^^
Bot prefix + command name.
Cat means "print the rest of this message".
"Template" (not valid shell, for the record):
| the first word after the two brackets
| indicates a command. The command modifies
| or uses the rest of the content in the
| brackets to insert something extra in the
| message.
vv
{{ping
^^^^
add an @ to whatever it gets as input
{{read 3592462}}}}
^^^^
read a message with the provided ID
{{read 3238278}}