This option specifies the output file name.
This option cannot be omitted except for when the -V, -h, or -l option is specified. An error will occur if this option is omitted.
| An error will occur if the output file name matches the input file name or the file name specified by the -r option. | 
| When this option is specified simultaneously with the -l option, a warning is output and this -o option is ignored. |