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How to change the screenshots save file location in MacOS X

I know how to capture my whole screen or just part of it. The screenshot is automatically saved to my desktop, and it is cluttering the entire desktop with .png screenshot files. How can I change where screenshots are saved on my MacOS X system instead of the default desktop location?
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How to pair Pi-hole with an OpenVPN to block ads and increase privacy on Ubuntu / Debian Linux

I followed your tutorial to install an OpenVPN on my Ubuntu server in the cloud. How can I install Pi-hole to block ads, reduced my 4G/3G/LTE traffic on the same Debian or Ubuntu Linux server?
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How to install wget on RHEL/CentOS 7 using yum

I am trying to download a file using ‘wget http://url’ syntax, but I am getting an error:

bash: wget: command not found

How do I fix this problem? How can I install wget on a CentOS/RHEL 7 or 6 server using yum command?
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How to add to bash $PATH permanently on Linux

I am a new Linux and bash shell user. How do I permanently set $PATH on Linux? How can I permanently add a directory to shell PATH on Linux?
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How to setup HTTP Strict Transport Security With Lighttpd Web Server

HTTP Strict Transport Security (HSTS) is a security feature that lets your web site tell client browsers that it should only be communicated with using HTTPS only. How can I setup HSTS using lighttpd web server on Linux or Unix-like system?
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How to check if port is in use on Linux or Unix

How do I determine if a port is in use under Linux or Unix-like system? How can I verify which ports are listening on Linux server?
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Linux kvm exit from a virsh console command

I installed KVM on Ubuntu server as described here. However, I am unable to get out of a ‘virsh console domain’ command. How can I exit from a “virsh console” connection over ssh based session?
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How to remove all old and outdated brew packages on MacOS

I am using Homebrew to install packages on MacOS Sierra or Mac OS X. I noticed multiple version of bash or curl installed in /usr/local/Cellar/bash/. How can I delete an outdated version of brew packages and only keep the latest version on my system?
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How to install LXD container hypervisor on Ubuntu 16.04 LTS server

How do I install LXD container “hypervisor” to runs unmodified Debian/Ubuntu/CentOS Linux operating systems VM at incredible speed on a Ubuntu Linux 16.04 LTS server?
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How to use curl command with http/2 on MacOS X

I am using a MacOS sierra (version 10.12.1). How do I use curl command with http2/ protocol? I am getting an error that read as follows:

            curl -I --http2 https://google.com
            curl: (1) Unsupported protocol

How do I solve this problem and use cURL with HTTP/2 on Mac OS X or MacOS Sierra?
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