I am new to macOS or Apple OS X. How do I enable colorized output for my ls command on Apple Mac OS X just like the ones that shown on my Ubuntu Linux server? How do I configure Mac OS X Terminal app to have color ls output?
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How do I install JDK runtime environment on a CentOS Linux version 6.x using yum command?
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How do I create and setup an OpenSSH config file to create shortcuts for servers I frequently access under Linux or Unix desktop operating systems?
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How do I set default printer in my Bash shell under CentOS Linux or FreeBSD unix desktop operating systems?
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I noticed that many shell scripts in /etc/init.d/ directory use the following syntax:

echo $“Usage $prog start|stop|reload|restart”

Why a double-quoted string preceded by a dollar sign ($”string”) using the echo command under Linux / UNIX bash scripts?
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How do I clear the shell history in Ubuntu Linux? How can I clear terminal command history in Ubuntu Linux? How do I clear bash history completely on Ubuntu Linux?
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