ifconfig, same as Windows ipconfig, chmod, modifies permissions, chown, change file ownership, ps, displays process informaition, apt-get & yum, installs packages, sudo, executes commands as admin, passwd, changes password, pwd, displays full path/filenames of working directory, shutdown, shuts down system, kill, terminates process, cat, displays file contents, grep, searches for matching information, dig, finds info related to DNS.

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