SYNOPSIS
snsplit [-r] [field... -] prog...DESCRIPTION
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.
ARGUMENTS
- prog...
-
is the program (with arguments) to run on each article. If
prog...
exits with any kind of failure,
snsplit
aborts.
- field...-
-
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.
OPTIONS
- -r
-
Expect input articles in rnews batch format instead.
ENVIRONMENT
snsplit sets some environment variables. If the environment already contains these variables, they will be overwritten.
- SEQUENCE
- 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.
- HEAD_LINES
- The number of lines in the head of the article, excluding the blank separator line.
- BODY_LINES
- The number of lines in the body of the article, excluding the blank separator line.
- FLD_FIELD
-
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.
EXIT CODES
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.