-bi Sendmail interprets the -bi option as a request to
rebuild its alias file. Exim does not have the
concept of a single alias file, and so it cannot
mimic this behaviour. However, calls to
/usr/lib/sendmail with the -bi option tend to
appear in various scripts such as NIS make files,
so the option must be recognized.
If -bi is encountered, the command specified by
the bi_command configuration option is run, under
the uid and gid of the caller of Exim. If the -oA
option is used, its value is passed to the command
as an argument. The command set by bi_command may
not contain arguments. The command can use the
exim_dbmbuild utility, or some other means, to
rebuild alias files if this is required. If the
bi_command option is not set, calling Exim with
-bi is a no-op.