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There is no parallel node in GNU Standards.
About the generic command format:
command [option]... [file]...
all file arguments should all be input files as far as possible, never output. Output files should usually be introduced by options. This is in GNU standards. But also, file should be the complete file name. Extension may be added as a facility for when file is not found as written. But if file exists as shown, it should be taken without adding extensions to it.