scriptlet for installing Flash plugin on an Ubuntu box

#!/bin/bash
# adapted from
# http://pastebin.com/PxNDQyqM
# which was adapted from
# http://www.myscienceisbetter.info/install-native-64bit-flash-player-11-on-linux.html

# changed to
# * breakout download URI for easy editing:
#   rest of script should not change much between Flash versions
# * use fewer literals
# * untar from stream
# * test mode: comment out `eval` line below to just see
#   what the script wants to do

FLASH_VERSION="Flash Player 11 beta 2 for 64-bit linux"
URI="http://download.macromedia.com/pub/labs/flashplatformruntimes/flashplayer11/flashplayer11_b2_install_lin_64_080811.tar.gz"
SO_FILENAME='libflashplayer.so'
TARBALL_FILENAME="$(basename ${URI})"
USR_MOZILLA_PLUGINS='/usr/lib/mozilla/plugins'
USR_FIREFOX_PLUGINS='/usr/lib/firefox/plugins'
USR_FIREFOX_ADDONS_PLUGINS='/usr/lib/firefox-addons/plugins'
USR_XULRUNNER_ADDONS_PLUGINS='/usr/lib/xulrunner-addons/plugins'
SO_FILEPATH="${USR_MOZILLA_PLUGINS}/${SO_FILENAME}"

for CMD in \
  "echo -e 'Stopping any Firefox that might be running:'" \
  "sudo killall -9 firefox" \
  "echo -e 'Removing any other flash plugins previously installed:'" \
  "sudo aptitude purge -y flashplugin-installer flashplugin-nonfree gnash gnash-common mozilla-plugin-gnash swfdec-mozilla libflashsupport nspluginwrapper" \
  "sudo rm -f ${USR_MOZILLA_PLUGINS}/*flash*" \
  "sudo rm -f /home/*/.mozilla/plugins/*flash*" \
  "sudo rm -f ${USR_FIREFOX_PLUGINS}/*flash*" \
  "sudo rm -f ${USR_FIREFOX_ADDONS_PLUGINS}/*flash*" \
  "sudo rm -rfd /usr/lib/nspluginwrapper" \
  "echo -e 'Installing ${FLASH_VERSION}:'" \
  "pushd $(mktemp -d)" \
  "wget -O - ${URI} | tar zxvf -" \
  "sudo cp ./${SO_FILENAME} ${SO_FILEPATH}" \
  "sudo cp -r usr/ /" \
  "echo -e 'Linking the libraries so Firefox and apps depending on XULRunner can find it:'" \
  "sudo ln -sf ./${SO_FILEPATH} ${USR_FIREFOX_ADDONS_PLUGINS}/" \
  "sudo ln -sf ./${SO_FILEPATH} ${USR_XULRUNNER_ADDONS_PLUGINS}/" \
  "echo -e 'Cleaning up:'" \
  "sudo rm -rf ./${SO_FILENAME}" \
  "sudo rm -rf usr/" \
  "sudo rm -rf ./${TARBALL_FILENAME}" \
  "popd" \
; do
  echo -e "${CMD}"
  eval "${CMD}"
done