DP has a nice write-up on the pv (for pipe viewer) command. One of his examples goes like this; also try it without the redirect to /dev/null.

for i in {1..21}; do date -d "`date +%m`/$i/`date +%Y`"; sleep 1; done | pv -leps 21 > /dev/null

To install on Feodra:

yum install pv