braa:tldr:789a9

The command you provided is using brace expansion in the following context: braa public@${ip}:${-1-3-6-*}.

Brace expansion allows you to generate a sequence of strings based on a pattern within curly braces {}. In this case, it looks like the pattern is ${-1-3-6-*}.

To provide a more accurate explanation, I would need more context about the variables and environment in which this command is being used. But based on what you provided, here is a general breakdown:

1. ${ip}: It seems like ip is a variable that holds an IP address.
2. ${-1-3-6-*}: This pattern consists of a hyphen-separated series of numbers (-1-3-6), followed by an asterisk (*). The hyphen-separated numbers represent a range of integers from 1 to 3 to 6 (1, 2, 3, 4, 5, 6). The asterisk indicates any number or character can follow the range.

Putting it together, the command braa public@${ip}:${-1-3-6-*} could be interpreted as generating multiple strings that form an address by combining public@, the IP address stored in the variable ip, and a range of possible numbers in the format -1-3-6-*.

For example, if the IP address stored in ip is 192.168.0.1, the brace expansion could generate the following possibilities:

1. public@192.168.0.1-1
2. public@192.168.0.1-2
3. public@192.168.0.1-3
4. public@192.168.0.1-4
5. public@192.168.0.1-5
6. public@192.168.0.1-6
7. public@192.168.0.1-*

Keep in mind that this explanation is based on limited information, so the actual behavior of the command may vary depending on the surrounding code and variables used.