no progress output for dd to /dev/null

[patrickdepinguin]

Perhaps this is related to issue #15 .
Following command:

dd if=/dev/urandom of=/dev/null bs=1M count=100000

does not yield output in 'progress'. It does detect a running dd command, since the warning "No command currently running" does not appear, but does not show any progress output.

Changing the output file to /tmp/foo fixes that.

Perhaps it is impossible to get accurate progress information in this case, but I'd expect a message telling me that.

[patrickdepinguin]

Regarding that last statement, dd itself can report progress info by sending a SIGUSR1 signal to it.

[ghost]

dd show progress with status option.
Example: # dd if=/dev/sda of=/dev/sdb bs=1024k status=progress

[Xfennec]

In the case of a dd if=/dev/urandom of=/dev/null, none of the file (input/output) reports fdinfo seek position, therefore progress can't report anything. I'll think about adding a message in this case.