reads lines from standard input and copies certain fields in
each line into files named by other fields within the line.
is intended to be called by
as an exploder feed.
opens a file it keeps it open.
The input must therefore never specify more files than can the
number of available descriptors can keep open.
If the ``-b'' flag is used, the program will allocate a buffer and
attach it to the file using
If the ``-c'' flag is used with a number
will close, and re-open, a file after every
lines are written to a file.
Similarly, the ``-C'' flag may be used to specify that all files should
be closed and re-opened every
The ``-d'' flag may be used to specify a directory the program should
change to before starting.
If this flag is used, then the default for the ``-s'' flag is changed to
be a simple ``%s.''
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; the ``-f''
flag may be
used to specify a different number of fields.
for an example.
If the ``-p'' flag is used, the program will write a line containing
its process ID (in text) to the specified file.
If the ``-l'' flag is used with a number
lines are written to a file.
If the ``-L'' flag is used with a number
then all files will be flushed every
By default, the program sets its standard error to
To suppress this redirection, use the ``-r'' flag.
After the initial fields, each remaining field names a file to
The ``-s'' flag may be used to specify a format string that maps
the field to a file name.
This is a
format string which should have a single ``%s'' parameter which will be given
The default value is
See the description of this flag in
If the ``-u'' flag is used, the program will request unbuffered output.
can be invoked as an exploder feed (see
As such, if a line starts with an exclamation point it will be treated
as a command.
There are three commands, described below:
The ``flush'' command closes and re-opens
all open files; ``flush xxx'' which flushes only the specified site.
These are analogous to the
and can be achieved by doing a ``send "flush xxx"'' command.
Applications can tell that the ``flush'' has completed by renaming the
file before issuing the command;
has completed the command when the original filename re-appears.
also changes the access permissions of the file from read-only for
everyone to read-write for owner and group as it flushes or closes each
It will change the modes back to read-only if it re-opens the same file.
The ``drop'' command is similar to the ``flush'' command except that any
files are not re-opened.
If given an argument, then the specified site is dropped, otherwise all
sites are dropped.
(Note that the site will be restarted if the input stream mentions the
``drop site'' command is sent,
will automatically forward the command to
if the site is a funnel that feeds into this exploder.
To drop all sites, use the
``send buffchan-site drop'' command.
The map file (specified with the ``-m'' flag) is reloaded.
Written by Rich $alz <email@example.com> for InterNetNews.
This is revision 1.11, dated 1996/10/29.