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filter.doc：源码内容

							   Cool features of innbbsd: adding filters
1. Install
  a. cd convert/hztty; make; make sys-type
  b. modify Makeifle, 
     choose one of the LAN options:
#LANG=BIG5
#LANG=GB
#LANG=ENGLISH
     uncomment out
#FILTER=
#FILTEROBJ=
  c. modify innd/filter.ctl
     to clarify as examples:
tw.bbs.*,alt.chinese.text.big5:big2gb:gb2big
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^^^^^^ ^^^^^^
newsgroups in wildcard pattern  ^       ^
and separated with ",".         |       |
			      receive  send
                              filter   filter
Three types of filters:
1. builtin
2. pipe stream of builtin filter
3. external commands
Available builtin filters
gb2big, big52gb, hz2gb, hz2big 
Useful external command filters
j2b (jis2big), b2j(big2jis) 
Successful testing:
builtin: 
  receive: big2gb, hz2gb, hz2big
  send:    gb2big, /usr/local/bin/b2g|/usr/local/bin/gb2hz
external:
  receive: /usr/local/bin/j2b
  send:    /usr/local/bin/b2j

						