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sed command

Linux / UNIX: Sed Replace Newline

How do I replace newline (\n) with sed under UNIX / Linux operating systems?
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Most Linux and UNIX-like system configuration files are documented using comments, but some time I just need to see line of configuration text in a config file. How can I view just the uncommented configuration file directives from squid.conf or httpd.conf file? How can I strip out comments and blank lines on a Linux or Unix-like systems?
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Q. How do I find the text between the strings FOO and BAR inclusive using sed command line option?
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sed Case Insensitive Search Matching

Q. How do I perform a case-insensitive search using sed under UNIX / Linux? I'd like to match all combination of word - foo, FOO, FoO and so on while replacing or performing other operations.
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Q. How do I insert a newline into the RHS of a substitution using sed under Linux / UNIX like operating systems? My line pattern is as follows:

This is a test. This is another input.

I'd like to insert a newline after dot (.).
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sed: Remove All Digits / Input From Input

Q. How do I remove all digits or number from my text file or input using sed command?
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Q. How do I find and replace character codes ( control-codes or nonprintable characters ) such as ctrl+a using sed command under UNIX like operating systems?
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