ethtool:tldr:8074d

The command ethtool is a Linux utility used to query and control network interfaces' settings and statistics. In this case, the command ethtool --identify ${eth0} ${10} is being used with two arguments:

1. ${eth0}: This is a variable representing the network interface device name. The value of ${eth0} could be something like eth0, which refers to the first Ethernet interface on the system.
2. ${10}: This is another variable that is likely representing the duration in seconds for the identification process. The value of ${10} is 10 seconds in this case.

So, the command is asking ethtool to activate the identification mechanism on the network interface specified by ${eth0} for a duration of ${10} seconds. This mechanism often blinks the LEDs on the network interface, helping users identify the physical device among multiple network interfaces.