|Check to see if the Unix you are using supports the -b or -c options of the mail or mailx command. -b is the blind copy option and -c is the copy. Some unix versions use ~b instead of -b.|
If you have more than one blind copy recipient, the string needs to be double quouted at least on my Solaris 9 box:
-b "firstname.lastname@example.org email@example.com"
This google or a variation will provide a lot of examples:
unix mailx bcc example