pv - progress bar for commands without progress indication

I wanted to write about this as I learnt it recently.

But Bharathi has already done it.

http://bharathi.posterous.com/one-day-one-gnulinux-command-pv

simple usage:

$ pv foo.iso | sha1sum

It shows ETA, percentage and time elapsed and many other things.

I use it in my ISO installer to show the progress of installation.

Since I use Perl nCurses I wanted a tool to show progress with my own interface
 but data should come from elsewhere in the backend.

pv has a -n switch which gave me just the percentage, so I used it and got my
 job done.

I was very happy. ;)

-Girish

--

-- 
Gayatri Hitech
http://gayatri-hitech.com
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