root at univrs in ~ # gem
gem:4: command not found: gem
root at univrs in ~ # which gem
gem () {
        local result
        command gem "$@"
        result="$?" 
        hash -r
        return $result
}
root at univrs in ~ # echo $PATH
/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin/:/home/sash/bin:/home/sash/hacks:/opt/mozilla/bin:/opt/java/jre/bin:/bin:/usr/local/bin
root at univrs in ~ # dpkg -l | grep "gem "
ii  gem                                     1:0.92.3-1                   Graphics Environment for Multimedia - PureData library