Follow-up Comment #1, bug #35590 (project avrdude):
Your second error is a usage error. It's not AVRDUDE's duty to
perform the tilde expansion (using ~ as an abbreviation for $HOME),
this is the job of your shell. However, the shell will only perform
tilde expansion if there is a white space in front of the tilde (or
the tilde is the very first character on the commandline). Thus,
programming works through
avrdude ... -U ~/path/to/file
because there is a space in front of the tilde.
But reading back by
avrdude ... -U flash:r:~/path/to/file:i
does not work since the shell does not expand the tilde (and there
is no directory named "~/path/to/").
Programming through
avrdude ... -U~/path/to/file
or
avrdude ... -U flash:w:~/path/to/file
would not work either.
The solution is to explicitly write $HOME:
avrdude ... -U flash:r:$HOME/path/to/file:i
About your first problem, I need more debugging information as I don't
have an USBasp programmer handy to test myself.
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