Neil,

in addition to the "magic script" of Samba that Michael already
mentioned, you might also use the print server functionality of
Samba. Simply configure a "dedicated dummy printer" in smb.conf
and adjust the "print command" to not invoke RawLP like done in
the default case, but some shell command or script that picks
up the "staged spoolfile" and performs the desired processing.

The Unix side would send the data with an smbclient similar to

 $ smbclient '\\your3k\dummyLP' -P -c 'print some-unix-file'

Your custom "print command" shell script on the 3000 would also
have to take care of returning the result file back to the Unix
side (e.g. by ftp or by using a similar smbclient trick).

Lars.

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