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Comment by echochar | Hacker News Reader

progress(1) is a separate utility on BSD; one of my favorites. (Although it is also built in to BSD ftp.)

I regularly use progress with dd, tar and other utilities.

At least one BSD dd now has a "msgfmt" option that outputs parseable, printf-style format strings.

Truthfully, I prefer it when these basic utilities are static except for fixing bugs. Using the new features in scripts means the scripts might lose some portability.

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There's also the pv(1) utility on Linux and OS X Homebrew:

  DESCRIPTION
  
       pv  shows the progress of data through a pipeline by giving infor-
       mation such as time elapsed, percentage completed  (with  progress
       bar), current throughput rate, total data transferred, and ETA.

       To use it, insert it in a pipeline between two processes, with the
       appropriate options.  Its standard input will be passed through to
       its  standard output and progress will be shown on standard error.

(edit: formatting)

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