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 GNU `sed''s Limitations and Non-limitations
 *******************************************
 
    For those who want to write portable `sed' scripts, be aware that
 some implementations have been known to limit line lengths (for the
 pattern and hold spaces) to be no more than 4000 bytes.  The POSIX
 standard specifies that conforming `sed' implementations shall support
 at least 8192 byte line lengths.  GNU `sed' has no built-in limit on
 line length; as long as it can `malloc()' more (virtual) memory, you
 can feed or construct lines as long as you like.
 
    However, recursion is used to handle subpatterns and indefinite
 repetition.  This means that the available stack space may limit the
 size of the buffer that can be processed by certain patterns.
 

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