zdbf is used to fetch records from a database file. Queries
are read from stdin or, optionally, from a text file. Records
with key values that match the queries will be printed to
stdout. By default, only the corresponding values will be
printed. However, if a delimiter character is provided, both keys and
values will be printed. Finally, an option is available to simply
print all records in the database.
In addition to the database file to be used and the common options,
zdbf command accepts the following options:
Fetch all the records in the database.
Delimiter character to separate printed keys from values (default none; only values will be printed).
Read queries from a file instead of from stdin.