gdbmtool utility allows you to view and modify an
existing GDBM database or to create a new one.
When invoked without arguments, it tries to open a database file called junk.gdbm, located in the current working directory. You can change this default by supplying the name of the database as argument to the program, e.g.:
$ gdbmtool file.db
The database will be opened in read-write mode, unless the -r (--read-only) option is specified, in which case it will be opened only for reading.
If the database does not exist,
gdbmtool will create it.
There is a special option -n (--newdb), which
instructs the utility to create a new database. If it is used and if
the database already exists, it will be deleted, so use it sparingly.