filechan - file-writing backend for InterNetNews


   filechan [ -d directory ] [ -f fields ] [ -m mapfile ] [ -p pidfile ]


   Filechan  reads  lines from standard input and copies certain fields in
   each line into files named by other fields within the  line.   Filechan
   is  intended  to  be called by innd(8) as a channel feed.  (It is not a
   full exploder and does not accept  commands;  see  newsfeeds(5)  for  a
   description of the difference and buffchan(8) for an exploder program.)

   Filechan  input is interpreted as a set of lines.  Each line contains a
   fixed number of initial  fields,  followed  by  a  variable  number  of
   filename  fields.   All  fields  in a line are separated by whitespace.
   The default number of initial fields is one.

   For each line of input, filechan writes the initial  fields,  separated
   by  whitespace and followed by a newline, to each of the files named in
   the filename fields.  When writing to a  file,  filechan  opens  it  in
   append  mode  and tries to lock it and change the ownership to the user
   and group who owns the directory where the file is being written.


   -f     The ``-f'' flag may be used to specify  a  different  number  of

   -d     By  default,  filechan  writes  its arguments into the directory
          /var/spool/news/out.going.  The  ``-d''  flag  may  be  used  to
          specify   a  directory  the  program  should  change  to  before

   -p     If the ``-p'' flag is  used,  the  program  will  write  a  line
          containing its process ID (in text) to the specified file.

   If filechan is invoked with ``-f 2'' and given the following input:
          news/software/b/132 <> foo uunet
          news/software/b/133 <> uunet munnari
          comp/sources/unix/2002 <> foo uunet munnari

   Then the file foo will have these lines:
          news/software/b/132 <>
          comp/sources/unix/2002 <>

   the file munnari will have these lines:
          news/software/b/133 <>
          comp/sources/unix/2002 <>

   and the file uunet will have these lines:
          news/software/b/132 <>
          news/software/b/133 <>
          comp/sources/unix/2002 <>

   Because  the  time  window  in  which  a  file  is  open is very small,
   complicated flushing and locking protocols  are  not  needed;  a  mv(1)
   followed by a sleep(1) for a couple of seconds is sufficient.

   -m     A  map  file  may  be specified by using the ``-m'' flag.  Blank
          lines and lines starting with a number sign (``#'') are ignored.
          All other lines should have two host names separated by a colon.
          The first field is the name that may appear in the input stream;
          the  second field names the file to be used when the name in the
          first field appears.  For example, the following map file may be
          used to map the short names above to the full domain names:
          # This is a comment


   Written  by  Robert  Elz  <>, flags added by Rich $alz
   <>.  This is revision 1.19, dated 1996/10/29.


   buffchan(8), innd(8), newsfeeds(5).



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