Check redirect on PG
Check drive-to-drive cp on PG

mv does not produce an error if the target file is non-writable, e.g., on a
different drive. This is due to a limitation in the Aztec C library, and could
be fixed by rewriting the rename using BDOS operations.

Prevent paging when input is not a terminal

hexdump always shows a full line of 16 bytes, even if the value of 'offset'
means that there isn't a full line to display. Missing data is padded with
zeros. This only affects the last line displayed.

