A wrapper for dd.
$ pip install ee
Or download the source and:
$ python setup.py install
All arguments are passed directly to dd. ee spawns a dd process with the arguments and then monitors it with SIGINFO (on OS X, or SIGUSR1 on Linux). Output reflects the amount of data copied.
If the input size can easily be determined, output will reflect the amount of data copied relative to the source size. Currently only regular files and disk device nodes that appear in diskutil on macOS or fdisk -l on Linux are reported upon in this manner.
Looks something like this while running:
$ ee if=/dev/zero of=/dev/null count=1024 bs=512m
18.00GB/512.00GB (4%) transferred in 2.76 seconds (6.52GB/sec)
Or:
$ ee if=/dev/zero of=/dev/null
2.74GB transferred in 5.44 seconds (515.36MB/sec)
This is pretty hacky and probably buggy. If it makes your pets catch fire, then I'm sorry (not sorry).