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3.2 Options for Programs that Read ID Databases

-f filename
Filename is the ID database to read when processing queries. At present, only a single ‘--file’ option is processed, but in future releases, more than one ID database may be named on the command line.
IDPATH’ is an environment variable that contains a colon-separated list of ID database names. If this variable is present, and no ‘--file’ options are presented on the command line, the ID databases named in ‘IDPATH’ are implied.1

If no ID databases are specified either on the command line or via the ‘IDPATH’ environment variable, then the ID utilities search for a file named ID in the current working directory, and then in successive parent directories.


[1] At present, this feature isn't fully implemented, since only the first of a list of ID database names is processed.