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       snsplit - split an article stream into individual articles


       snsplit [-r] [field... -] prog...


       snsplit  reads  an  article stream from descriptor 0 and splits it into
       separate articles, invoking prog...  on each, with the article avaiable
       on  descriptor 0.  This is useful as a quick-and-dirty way of filtering
       an article stream.

       The incoming article stream is expected to  be  in  wire  format,  with
       lines ending in CRLF, leading dots doubled, and delimited by a dot on a
       line by itself.

       The article presented to prog...  will have lines that end  in  a  bare
       newline,  will  have  all  header  lines unfolded, leading dots will be
       unstuffed, and the article will be terminated by end-of-file.


              is the program (with arguments) to  run  on  each  article.   If
              prog...  exits with any kind of failure, snsplit aborts.

              are  optional  header  field names.  If these are specified, the
              value of the first header field of that name  will  be  exported
              into the environment.  This field...  list must be terminated by
              the hyphen.  See also ENVIRONMENT below.


       -r     Expect input articles in rnews batch format instead.


       snsplit sets some environment variables.  If  the  environment  already
       contains these variables, they will be overwritten.

              If  already  set  to a positive value, it is incremented for the
              first article.  If it isn’t set, is set to  one  for  the  first
              article.   Thereafter  it  is  incremented  for  each subsequent
              article.  The value is always  a  6-digit  number  with  leading
              zeroes, and it can roll over.

       BYTES  contains the size of the current article.

              The  number  of  lines in the head of the article, excluding the
              blank separator line.

              The number of lines in the body of the  article,  excluding  the
              blank separator line.

              If  any fields are specified on the command line, where field is
              the name of an article header field, then FLD_FIELD will be  set
              to the value of field, where FIELD is the same as field but with
              lower case characters changed to upper  case,  and  all  hyphens
              changed  to  underscores.   Confusing?   If field is message-id,
              then FLD_MESSAGE_ID will be  set  to  the  value  of  the  first
              Message-ID field in the current article, if there is one.


       snsplit  exits 0 on success, 1 on usage error, 2 on system error, and 3
       on article format error.  If prog...  exits with other than 0,  snsplit
       will also exit that value.