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If you're running a command with a lot of output, this serves as a simple progress indicator.
This avoids the need to use `/dev/null` for silencing. It works for any command that outputs lines, updates live (`fflush` avoids buffering), and is simple to understand.
There are 2 alternatives - vote for the best!
this version only uses shell builtins
If you can do better, submit your command here.
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