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 Introduction to GNU `dbm'.
    GNU `dbm' (`gdbm')is a library of database functions that use
 extendible hashing and works similar to the standard UNIX `dbm'
 functions.  These routines are provided to a programmer needing to
 create and manipulate a hashed database. (`gdbm' is _NOT_ a complete
 database package for an end user.)
    The basic use of `gdbm' is to store key/data pairs in a data file.
 Each key must be unique and each key is paired with only one data item.
 The keys can not be directly accessed in sorted order.  The basic unit
 of data in `gdbm' is the structure:
        typedef struct {
                   char *dptr;
                   int  dsize;
                } datum;
    This structure allows for arbitrary sized keys and data items.
    The key/data pairs are stored in a `gdbm' disk file, called a `gdbm'
 database.  An application must open a `gdbm' database to be able
 manipulate the keys and data contained in the database.  `gdbm' allows
 an application to have multiple databases open at the same time.  When
 an application opens a `gdbm' database, it is designated as a `reader'
 or a `writer'.  A `gdbm' database opened by at most one writer at a
 time.  However, many readers may open the database open simultaneously.
 Readers and writers can not open the `gdbm' database at the same time.
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