cd /tmp/
curl -O http://fpdownload.macromedia.com/get/flashplayer/current/install_flash_player_osx_ub.dmg.zip
unzip install_flash_player_osx_ub.dmg.zip

Next, I used “hdiutil” to mount the disk image and then changed to that directory.

hdiutil attach Install\ Flash\ Player\ 10\ UB.dmg
cd /Volumes/Install\ Flash\ Player\ 10\ UB/

Then I used “installer” to install the package specifying the package with “-pkg Adobe\ Flash\ Player.pkg” and the target volume with “-target /”.

installer -verbose -pkg Adobe\ Flash\ Player.pkg -target /

It will run through the installation and output some information. After that, I changed back to the temp directory. I initially tried using “umount” to unmount the disk image, but that is a bad idea because it doesn’t fully unmount the image. The better approach is to use the “hdiutil” again. I find the volume to unmount by using the “df” command. Once it is unmounted, I deleted the zip file and the disk image.

cd /tmp/
hdiutil detach $(df | grep Flash | awk '{print $1}')
rm install_flash_player_osx_ub.dmg.zip
rm Install\ Flash\ Player\ 10\ UB.dmg

Most applications for Mac OS X come in disk images, and many of those have package installers. This is a quick way to install software on a remote Macintosh or a way to automate installations with scripts.