• a text file is not a text file
• unix/linux systems terminate lines in a LINEFEED character
• DOS, OS/2, MS Windows terminate lines with CARRIAGERETURN+LINEFEED characters
• sed can barf on the CR+LF
• dos2unix converts CR+LF line endings to LF line endings
• dos2unix lab.sed converts lab.sed to be a unix file
• why is this important?
• some mail systems treat all text files as DOS files
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