Default File Manager in Gnome

Introduction

The default file manager in Ubuntu is Nautilus. Some people prefer other file managers. Unfortunately, it's difficult to make other file managers the default, especially since Nautilus manages the desktop icons in Gnome (Ubuntu's desktop environment).

Disclaimer

The first version of this script has been written by a non-programmer. It has been tested and works but, as you can see from the comments in the script, it could still be tweaked to be "better."

Script to change Thunar to be the default file manager

To run this script, paste this block of code into a text file and save it as a file named defaultthunar in your home folder.

## Originally written by aysiu from the Ubuntu Forums
## This is GPL'ed code
## So improve it and re-release it

## Define portion to make Thunar the default if that appears to be the appropriate action
makethunardefault()
{
## I went with --no-install-recommends because 
## I didn't want to bring in a whole lot of junk,
## and Jaunty installs recommended packages by default.
echo -e "\nMaking sure Thunar is installed\n"
sudo apt-get update && sudo apt-get install thunar --no-install-recommends

## Does it make sense to change to the directory?
## Or should all the individual commands just reference the full path?
echo -e "\nChanging to application launcher directory\n"
cd /usr/share/applications
echo -e "\nMaking backup directory\n"

## Does it make sense to create an entire backup directory?
## Should each file just be backed up in place?
sudo mkdir nonautilusplease
echo -e "\nModifying folder handler launcher\n"
sudo cp nautilus-folder-handler.desktop nonautilusplease/

## Here I'm using two separate sed commands
## Is there a way to string them together to have one
## sed command make two replacements in a single file?
sudo sed -i -n 's/nautilus --no-desktop/thunar/g' nautilus-folder-handler.desktop
sudo sed -i -n 's/TryExec=nautilus/TryExec=thunar/g' nautilus-folder-handler.desktop
echo -e "\nModifying browser launcher\n"
sudo cp nautilus-browser.desktop nonautilusplease/
sudo sed -i -n 's/nautilus --no-desktop --browser/thunar/g' nautilus-browser.desktop
sudo sed -i -n 's/TryExec=nautilus/TryExec=thunar/g' nautilus-browser.desktop
echo -e "\nModifying computer icon launcher\n"
sudo cp nautilus-computer.desktop nonautilusplease/
sudo sed -i -n 's/nautilus --no-desktop/thunar/g' nautilus-computer.desktop
sudo sed -i -n 's/TryExec=nautilus/TryExec=thunar/g' nautilus-computer.desktop
echo -e "\nModifying home icon launcher\n"
sudo cp nautilus-home.desktop nonautilusplease/
sudo sed -i -n 's/nautilus --no-desktop/thunar/g' nautilus-home.desktop
sudo sed -i -n 's/TryExec=nautilus/TryExec=thunar/g' nautilus-home.desktop
echo -e "\nModifying general Nautilus launcher\n"
sudo cp nautilus.desktop nonautilusplease/
sudo sed -i -n 's/Exec=nautilus/Exec=thunar/g' nautilus.desktop

## This last bit I'm not sure should be included
## See, the only thing that doesn't change to the
## new Thunar default is clicking the files on the desktop,
## because Nautilus is managing the desktop (so technically
## it's not launching a new process when you double-click
## an icon there).
## So this kills the desktop management of icons completely
## Making the desktop pretty useless... would it be better
## to keep Nautilus there instead of nothing? Or go so far
## as to have Xfce manage the desktop in Gnome?
echo -e "\nChanging base Nautilus launcher\n"
sudo dpkg-divert --divert /usr/bin/nautilus.old --rename /usr/bin/nautilus && sudo ln -s /usr/bin/thunar /usr/bin/nautilus 
echo -e "\nRemoving Nautilus as desktop manager\n"
killall nautilus
echo -e "\nThunar is now the default file manager. To return Nautilus to the default, run this script again.\n"
}

restorenautilusdefault()
{
echo -e "\nChanging to application launcher directory\n"
cd /usr/share/applications
echo -e "\nRestoring backup files\n"
sudo cp nonautilusplease/nautilus-folder-handler.desktop .
sudo cp nonautilusplease/nautilus-browser.desktop .
sudo cp nonautilusplease/nautilus-computer.desktop .
sudo cp nonautilusplease/nautilus-home.desktop .
sudo cp nonautilusplease/nautilus.desktop .
echo -e "\nRemoving backup folder\n"
sudo rm -r nonautilusplease
echo -e "\nRestoring Nautilus launcher\n"
sudo rm /usr/bin/nautilus && sudo dpkg-divert --rename --remove /usr/bin/nautilus
echo -e "\nMaking Nautilus manage the desktop again\n"
nautilus --no-default-window &

## The only change that isn't undone is the installation of Thunar
## Should Thunar be removed? Or just kept in?
## Don't want to load the script with too many questions?
}



## Make sure that we exit if any commands do not complete successfully.
## Thanks to nanotube for this little snippet of code from the early
## versions of UbuntuZilla
set -o errexit
trap 'echo "Previous command did not complete successfully. Exiting."' ERR


## This is the main code
## Is it necessary to put an elseif in here? Or is
## redundant, since the directory pretty much
## either exists or it doesn't?
## Is there a better way to keep track of whether
## the script has been run before?
if [[ -e /usr/share/applications/nonautilusplease ]]; then 

restorenautilusdefault 

else

makethunardefault

fi;

Then paste these commands into the terminal

chmod +x defaultthunar
./defaultthunar

Restoring Nautilus as a default

Just run the script again

./defaultthunar

Script to change Dolphin to be the default file manager

To do later when the Thunar script has been improved upon

Ubuntu Documentation

DefaultFileManager