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 fields.
-d By default, filechan writes its arguments into the directory
<config$_PATH_BATCHDIR> (typically /var/news/spool/out.going.) The
``-d'' flag may be used to specify a directory the program should
change to before starting.
-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 <email@example.com> foo uunet
news/software/b/133 <firstname.lastname@example.org> uunet munnari
comp/sources/unix/2002 <email@example.com> foo uunet munnari
Then the file foo will have these lines:
the file munnari will have these lines:
and the file uunet will have these lines:
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 <firstname.lastname@example.org>, flags added by Rich $alz
<email@example.com>. This is revision 1.19, dated 1996/10/29.
buffchan(8) , innd(8) , newsfeeds(5) .
You can find a summary and links related to this topic
as part of the Mib Software Usenet RKT.