1: #!/bin/ksh
   2: 
   3: # Start the dndlookup program as a coprocess
   4: # Tell it to output only the canonical full name, and to not print multiple matches
   5: dndlookup -fname -u |&
   6: 
   7: # move the input/output streams so we 
   8: # can use other coprocesses too
   9: exec 4>&p
  10: exec 5<&p
  11: 
  12: cat namefile
  13: 
  14: # read the names from a file "namefile"
  15: while read uname; do
  16:   print -u4 $uname
  17:   read  -u5 dndname
  18:   case $dndname in
  19:   *many\ matches*)
  20:     # handle case where the name wasn't unique
  21:     print "Multiple matches to \"$uname\" in DND"
  22:     ;;
  23:   *no\ match*)
  24:     # handle case where the name wasn't found
  25:     print "No matches to \"$uname\" in DND"
  26:     ;;
  27:   *)
  28:     # we seem to have a hit - process the
  29:     # canonical named retrieved from dndlookup
  30:     print "Unique DND match: full name for \"$uname\" is \"$dndname\""
  31:     ;; 
  32:   esac
  33: done < namefile
  34: 
  35: # We've read all the names, but the coprocess
  36: # is still running.  Close the pipe to tell it
  37: # we have finished.
  38: exec 4>&-