+ This option is only useful in interactive mode. If stdin is redirected
+ from a script, and the script contains several queries one can use
+ this option to let each query write its output to a different file.
+
+ If the option is not given, or its argument is either \"-\" or the
+ empty string, stdout is assumed. The following conventions cause the
+ output to be written in a different way:
+
+ \"path\" may be prepended by '>' which instructs adu to truncate
+ the output file to length zero. If \"path\" does not start with
+ '>' and \"path\" already exists, the query is aborted. Otherwise,
+ the file is created and truncated. The output file name \">\" is
+ considered invalid.
+
+ If the first two characters of \"path\" are '>', the output file
+ (given by removing the leading \">>\" from \"path\") is opened in
+ append mode. It is no error if the output file does not exist. However,
+ as above the output file name \">>\" is considered invalid.
+
+ If the first character of \"path\" is '|', a pipe is created and the
+ rest of \"path\" is executed with stdin redirected to the reading
+ end of the pipe while the query output is written to the writing end
+ of the pipe. Again, specifying only \"|\" is considered invalid and
+ causes an error.
+
+ See the manual page for examples.