Bash progress bar [duplicate]

Question

I'm using the following script to go through a large list of domains in whois and find the registrar (useful for server/DNS migrations) and it works fine.

However I am wanting to incorporate a progress bar into it just for the sake of convenience. Here's my script, if it can be improved let me know:

#!/bin/bash
for f in `cat /var/www/vhosts/domainlist`
 do
   if
   domain=$f
   [ "$domain" ] ;
   then
    whois $f | grep -i domainregistrar > /dev/null
     if
     [ $? -le 0 ] ;
     then
      echo $f >> our_registrar
     else
      echo $f >> external_registrar
     fi
   fi
 done
echo "Done, check our_registrar file."

I've tried this first: http://moblog.bradleyit.com/2010/02/simple-bash-progress-bar-function.html

And then this but with no luck.

What do you reckon is the easiest way to get a progress bar implemented into that script?

Answer 1

You can use pv but the other way.

 for ... # outer loop
 do
   ...
   echo -n X
 done | pv -s $(wc -l 'your_file_list') - >/dev/null 

so you use echo X to say when another portion of work is done and this is counted by pv, it's know what the whole job size is due to -s option.