how to remove trash file with command line

1.remove trash file
#sudo rm -rf ~/.local/share/Trash

2.when logout to clean trash file
#sudo vim ~/.bashrc
add new lins to run command
sync; sync; sync
rm -rf ~/.local/share/Trash

how to install firefox3.5

1.modify apt-get repository
add two lines as below
deb http://ppa.launchpad.net/ubuntu-mozilla-daily/ppa/ubuntu jaunty main
deb-src http://ppa.launchpad.net/ubuntu-mozilla-daily/ppa/ubuntu jaunty main

2.import PPA GPG key
#sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 247510BE

3.run command to install firefox35 or firefox36
sudo apt-get update && sudo apt-get install firefox-3.5