Tcpdump: verbose output suppressed, use -v or -vv for full protocol decode tcpdump is almost available in all major Linux distributions. It also provides an option to save captured packages in a file for later analysis. The tcpdump command is one of the most widely used command-line network packet analyzer or packet sniffer programs that is used to capture or filter TCP/IP packets that are received or transferred on a specific interface over a network. # lsofĬOMMAND PID TID TASKCMD USER FD TYPE DEVICE SIZE/OFF NODE NAME The most common format for lsof command is. With this command, you can easily identify which files are in use. One of the main reasons for using this command is when a disk cannot be unmounted and displays the error that files are being used or opened. The open files included are disk files, network sockets, pipes, devices, and processes. The lsof command is used in many Linux/Unix-like systems to display a list of all the open files and processes.
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