Install Rails/lighttpd with DarwinPorts for Tiger

install darwinports package

Add 'export PATH=/opt/local/bin:$PATH' to ~/.bashrc

sudo port -d selfupdate

sudo port install ruby

sudo port install rb-rubygems

sudo gem install rails --include-dependencies

sudo port install readline

sudo port install lighttpd

vi /opt/local/etc/lighttpd.conf [edit lighttpd.conf to your liking]

set up launchd item for lighttpd
        -- restart lighttpd: sudo launchctl stop net.lighttpd
                             sudo launchctl start net.lighttpd

sudo port install fcgi

sudo port install rb-fcgi
         
install official OS X MySQL package (not darwinports)

sudo gem install mysql -- --with-mysql-dir=/usr/local/mysql

Links:
darwinports package
launchd item
OS X MySQL package

Mount and install OS X packages from the command line

If you need to install a .pkg application wrapped in a .dmg file from the command line (say, if you only have SSH access to the machine) there are a few command line utilities that will let you do this. For instance, let's say you're trying to install DarwinPorts on a remote OS X box.

cd ~/Desktop

curl -O http://darwinports.opendarwin.org/downloads/DarwinPorts-1.2-10.4.dmg

hdiutil attach DarwinPorts-1.2-10.4.dmg

cd /Volumes/DarwinPorts-1.2/

sudo installer -pkg DarwinPorts-1.2.pkg -target "/"

hditutil detach /Volumes/DarwinPorts-1.2/

In a nutshell, this 1) goes to your Desktop folder 2) grabs DarwinPorts from the opendarwin site 3) mounts the dmg 4) goes to the newly mounted DarwinPorts volume 5) installs the package, targeted to the root, as the root user 6) ejects the mounted disc image.