+appended and decompressed body fed to command's @code{stdin}.
+
+If @option{-use-tmp} option is specified, then @code{stdin} data is read
+into temporary file first, requiring twice more disk space, but no
+memory requirements. @ref{StdinTmpFile, Same temporary file} rules
+applies as with @ref{nncp-file, nncp-file -} command.