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Novice Linux / Unix System Administrator Tutorials

These tutorials assumes that you have basic understanding of Unix like operating systems and you are familiar with – Unix/Linux and its commands at the user level, know how to edit files, familiar with the Bourne shell/Bash/Ksh shell, know how to perform standard file processing tasks (such as find/move/copy/delete/) and so on. ( rss feed )

Is there a CPU-Z like a freeware/open source software that detects the central processing unit (CPU) of a modern personal computer in Linux operating system? How can I get detailed information about the CPU(s) gathered from the CPUID instruction, including the exact model of CPU(s) on Linux operating system?
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I removed www.example.com/foo/file.html from my domain. But, it is still being crawled by Google/Yahoo and many other bots. How do I return a HTTP-410 gone error i.e. tell these bots that resource permanently does not exist using Apache HTTPD server on a CentOS/RHEL/Fedora/Ubuntu/Debian and Unix-like operating system?
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How to install Composer on Debian / Ubuntu Linux

I'm trying to upgrade my Mediawiki installation and I'm getting an error that read as follows:
    Error: your composer.lock file is not up to date, run "composer update" to install newer dependencies
How do I install composer command for my PHP installation on Debian or Ubuntu Linux running LAMP or LEMP stack? How do I Install and use Composer on running Ubuntu Linux server and fix this problem for mediawiki installation and/or manage and install PHP packages and dependencies for my project?
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My Fedora Linux 23 workstation based laptop can only be accessed through our corporate proxy servers. How do I access and use dnf command with a web proxy server on a Fedora Linux? How do I configure dnf to use a proxy server only?
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I use ssh client to login into my Mac Min server without GUI. How can I tell what version of Mac OS X operating system am I using command prompt? How do I find out Mac OS X version from Terminal app bash shell?
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How do I determine the system resource usage during of execution of a particular command on a Linux, OS X Unix, BSD and Unix-like operating system?
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I'm a new Ubuntu Linux user and noticed that old kernel still exists in my system. Why doesn't Ubuntu remove old kernels automatically? How do I delete old unused kernel images to free disk space. How to remove unused old kernel images on Ubuntu Linux safely?
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