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docker save with a progress bar
# If you're impatient like me, a progress bar can be a comforting way to impulsively check the progress
# of your docker save command
#
# You'll need tqdm installed (https://github.com/tqdm/tqdm) for this to work.
docker save IMAGE_NAME | tqdm --bytes --total $(docker image inspect IMAGE_NAME --format='{{.Size}}') > OUTPUT_TAR_NAME
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