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my $dbh = DBI->connect ("dbi:CSV:f_dir=/root", undef, undef, {
    f_ext      => ".csv",
    RaiseError => 1,
}
);

my $dbh = DBI->connect ("dbi:CSV:f_dir=root", undef, undef, {
    f_ext      => ".csv",
    RaiseError => 1,
}
);

my $dbh = DBI->connect ("dbi:CSV:", undef, undef, {
    f_ext      => ".csv",
...
    f_dir      => "/root",
}
);

my $dbh = DBI->connect ("dbi:CSV:", undef, undef, {
    f_ext      => ".csv",
...
    f_dir      => "root",
}
);