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Linux_Unix
Cool, but obscure unix tools :: KKovacs
Just a list of 20 (now 28) tools for the command line. Some are little-known, some are just too useful to miss, some are pure obscure -- I hope you find something useful that you weren't aware of yet! Use your operating system's package manager to install most of them. (Thanks for the tips, everybody!) dstat & sar iostat, vmstat, ifstat and much more in one.
Learn Linux, 101: The Linux command line
Overview This article gives you a brief introduction to some of the major features of the bash shell, and covers the following topics: Interacting with shells and commands using the command line Using valid commands and command sequences Defining, modifying, referencing, and exporting environment variables Accessing command history and editing facilities Invoking commands in the path and outside the path Using man (manual) pages to find out about commands This article helps you prepare for Objective 103.1 in Topic 103 of the Junior Level Administration (LPIC-1) exam 101.
Computer Networking