Using bash auto_completion features

When standard bash completion is not enough try installing bash-completion package from EPEL repository.
# yum install bash-completion

Now log off and on again or run:
# source /etc/bash_completion

You should get more logical hints, try this:
# ifup [TAB][TAB]
eth0 eth0:0 eth0.bak lo

See - it's now suggesting (and completing) interface names instead of files in the current directory. Cool stuff!