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Program:  segd2disk
Purpose:  Read a SEG-D tape to disk.
Usage:     segy2disk device-name output-directory

     The tape device must be Berkeley (tape is positioned after the file mark
when the file mark is detected) and "no rewind" when the Unix command 

     A new disk file is created for every tape file (shot).  The disk file is 
named    X.sgd    where X is the counter of tapes files read by segd2disk.
The file counter starts with 1 everytime segd2disk is initiated, meaning
that if segd2disk is used on the same tape without rewinding, different
tape files will have different file names and there will be duplicate file 

Sun Example:
segd2disk  /dev/rmt/2stbn /tmp