Recognizing Newlines with Sed

I successfully used "cat <file> | tr -d '\n'" on a file that "sed
's/\n//g' <file>" failed to properly recognize.  I need sed to
effectively recognize newlines or ask that someone provide a perl
script that will.

Other types used: \d015 (d: decimal), \r, \<newline>, \$, $, .*, *.  I
even used an ampersand before each one and I updated sed.

Note: Detailed Document(s) and Sample(s) are more than welcome.
      When you reply to this message, please include
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*********************************************************************
Signed,
SoloCDM

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