Something like the following bash script will retrieve the lastest com.company:artifact snapshot from the snapshot repo:
# Artifactory location
server=http://artifactory.company.com/artifactory
repo=snapshot
# Maven artifact location
name=artifact
artifact=com/company/$name
path=$server/$repo/$artifact
version=$(curl -s $path/maven-metadata.xml | grep latest | sed "s/.*<latest>\([^<]*\)<\/latest>.*/\1/")
build=$(curl -s $path/$version/maven-metadata.xml | grep '<value>' | head -1 | sed "s/.*<value>\([^<]*\)<\/value>.*/\1/")
jar=$name-$build.jar
url=$path/$version/$jar
# Download
echo $url
wget -q -N $url
It feels a bit dirty, yes, but it gets the job done.