Proto Recv-Q Send-Q Local Address Foreign Address State # netstat -a | moreĪctive Internet connections (servers and established) It is very useful tool for every system administrator to monitor network performance and troubleshoot network related problems. Netstat is a command line tool for monitoring incoming and outgoing network packets statistics as well as interface statistics.
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Tcpdump: verbose output suppressed, use -v or -vv for full protocol decode tcpdump is almost available in all major Linux distributions. It also provides a option to save captured packages in a file for later analysis. Tcpdump one of the most widely used command-line network packet analyzer or packets sniffer program that is used capture or filter TCP/IP packets that received or transferred on a specific interface over a network. Init 1 root 10u FIFO 0,17 953 /dev/initctl 4. # lsofĬOMMAND PID USER FD TYPE DEVICE SIZE NODE NAME The most common format for this command is. With this commmand you can easily identify which files are in use.
One of the main reason 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. Lsof command used in many Linux/Unix like system that is used to display list of all the open files and the processes.
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By default vmstat command is not available under Linux systems you need to install a package called sysstat that includes a vmstat program. Linux VmStat command used to display statistics of virtual memory, kernerl threads, disks, system processes, I/O blocks, interrupts, CPU activity and much more.
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