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nettop:tldr:1943a
The command "nettop -m ${tcp} -t ${loopback}" is used to run the "nettop" utility with specific options. Here is an explanation of each option:
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"-m ${tcp}": This option specifies that only TCP (Transmission Control Protocol) connections should be displayed. TCP is a widely used protocol for reliable transmission of data over networks.
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"-t ${loopback}": This option specifies that network traffic for the loopback interface should be included in the display. The loopback interface is a virtual network interface that allows network applications to communicate with each other on the same device.
By combining both options, the command will run the "nettop" utility and display information about TCP connections, as well as the network traffic on the loopback interface.