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babeld:tldr:b6766
The command "babeld ${eth0} ${eth1} ${wlan0}" is invoking the "babeld" program, which is a routing protocol daemon for the Babel protocol. The daemon manages routing tables and exchanges routing information with other routers in a network.
The "${eth0}", "${eth1}", and "${wlan0}" are placeholders for network interfaces. These placeholders are typically used in command-line shells to represent the actual values of network interface names.
When executing the command, the placeholders should be replaced with the actual names of the network interfaces on your system. For example, if your system has three network interfaces named eth0, eth1, and wlan0, the command would be:
babeld eth0 eth1 wlan0
This specifies that babeld should run on these three network interfaces, using them to send and receive routing information.