Failed to set locale, defaulting to C warning message on CentOS Linux when running yum

Whenever I run yum command, I get an error or warning that read as Failed to set locale, defaulting to C. How do I fix this issue on CentOS 7 Linux server? Why do I get “Failed to set locale, defaulting to C” when using yum on CentOS 6 or Fedora Linux system? How do I fix it?
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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 undefine and unset a bash environment variable on Linux or Unix

I have set the shell variable. I no longer need the variable. How do I undefine or unset a variable in bash on a Linux or Unix-like desktop system?
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Minify and Compress CSS & Javascript Files At a Linux/Unix Shell Prompt

How do I minify and compress CSS & JS files on Linux or Unix-like system using shell prompt on my server? How can I minify JavaScripts and stylesheets at shell prompt so they can download faster over the Internet without using any online tools?
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CentOS Install Java SDK using yum Command

How do I install JDK runtime environment on a CentOS Linux version 6.x using yum command?
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Linux / Unix: Read a Man Page From Local Directory

I have a man page stored in my home directory called ~/foo.1. How do I read a $HOME/foo.1 man page file? How can I read the file called ~/foo.1 as a manpage with man command?
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TCSH / CSH Shell Set PATH Variable

I am a new Unix / Linux / Apple OS X user. What is my path in CSH / TCSH shell? How do I set or modify path in c shell (CSH) on Unix like operating systems?
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export command