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How to backup and restore a partition table on Linux

Is it possible to just backup my Linux partition table and restore it when required? How do I restore partition table if it get deleted by mistake on Linux operating system? How do I backup and restore a GPT partition table on Linux?
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How do I find out the current time for each zone name specified on the command line on a Linux, FreeBSD, OS X or Unix-like system? How do I report time zone information for Singapore or Japan on the command line?
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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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The Intel Advanced Encryption Standard (AES) or New Instructions (AES-NI) engine enables extremely fast hardware encryption and decryption for openssl, ssh, vpn, Linux/Unix/OSX full disk encryption and more. How do I check support for Intel or AMD AES-NI is loaded in my running Linux in my Linux based system including openssl?
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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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How do I install rsnapshot a filesystem snapshot utility based on rsync on my FreeBSD server to backup my local/remote Linux and Unix-based desktop, server and laptop system?
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