Go to the list of seismic processes.      Go to SIOSEIS introduction. 
sioseis script to extract every 100th shot from a disk file.




sioseis << eof
procs diskin diskoa END 
 diskin 
   set 3 6 
    ipath /archive/mcs/1997/nbp9702/tape39 fno 2500 lno 4000 noinc 100 END 
 END 
 prout 
    fno 0 lno 99999 ftr 0 ltr 9999 END 
 END 
 diskoa
   opath tape39by100 end
end
end