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curl command

I know how to use wget command to grab files. But, how do you download file using curl command line under Linux / Mac OS X / BSD or Unix like operating systems?
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Linux / Unix curl: Pass HTTP Referer

How do I pass the referrer (HTTP referrer)as an HTTP header field using curl command under Linux OR Unix operating systems?
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Varnish Change Web Server Signature Headers

I'm using Varnish cache infront of Apache web server and I'd like change my web server signature from

Apache/2.2.8 (Ubuntu) mod_python/3.3.1 Python/2.5.2 mod_ssl/2.2.8 OpenSSL/0.9.8g


Apache Web server

How do I change headers using Varnish?
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I'm behind a squid proxy server. How do I access internet via proxy server when I use wget, lynx and other utilities from a shell prompt on a Linux or Unix-like systems?
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Fingerprint / Identify Remote Web Server

Q. How do I fingerprint or identify remove web server a from UNIX / Linux shell prompt?
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