indexdump [options] file [ tag ]
where options are
        --debug         output record separator (default newline)
        --type          specifies the num/date/char type of the index
        --start         defines the value to start dump from
        --n             prints also the total number of records
                        in the file
 
        indexdump rooms.cdx FACILITY
        indexdump --debug=14 --start=Dub rooms.cdx ROOMNAME
 
The output contains the index key and the value, which is the record number in the correcponding dbf file.
For mulitag index files (like cdx), you need to specify the tag name to get the actual data.