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Set/Export: http_proxy With Special Characters In Password Under Unix / Linux

My proxy server password has special characters such as !,@, and so on. How do I set and export the variable called http_proxy or HTTP_PROXY when password has special characters under Unix like operating systems?
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Explains: echo Command (echo $”string”) Double-quoted String Preceded By a Dollar Sign

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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