Bash alias to change dir to a subdirectory containing a known file

gistfile1.txt

#
# Usage: cdf style.css
#
# Add to your ~/.bash_profile and then source ~/.bash_profile
#
# If you were in ~/somedir, this could cd ~/somedir/docroot/styles/ if it contained style.css
#

alias cdf=cdfilefunc

cdfilefunc()
{
    DIRNAME=`find . -name "$1" -exec dirname {} \;`
    cd $DIRNAME
}