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