Command-line basicsCommand flagsThe piping command outputGathering general informationw – show who is logged on and what they are doingrpm – RPM package managerListing all packages installedListing all files deployed by a packageUsing package verificationdf – report file system space usageShowing available inodesfree – display memory utilizationWhat is free, is not always freeThe /proc/meminfo fileps – report a snapshot of current running processesPrinting every process in long formatPrinting a specific user's processesPrinting a process by process IDPrinting processes with performance informationNetworkingip – show and manipulate network settingsShow IP address configuration for a specific deviceShow routing configurationShow network statistics for a specified devicenetstat – network statisticsPrinting network connectionsPrinting all ports listening for tcp connectionsDelayPerformanceiotop – a simple top-like I/O monitoriostat – report I/O and CPU statisticsManipulating the outputvmstat – report virtual memory statisticssar – collect, report, or save system activity informationUsing the sar command