diff --git a/install.sh b/install.sh
index 1d4850d..02e8322 100755
--- a/install.sh
+++ b/install.sh
@@ -2,6 +2,80 @@
 
 set -e
 
+function print_help() {
+	echo "usage .home/update.sh [-g/--gnome] [-h/--help] [-v/--berbose] [-d/--dry]
+
+Installs and updates shared configuration on a system. Options are:
+
+  -h/--help    : print this help
+  -g/--gnome   : system is intended to run in a GNOME environement, and
+                 will setup gnome-terminal accordingly. Do not
+                 activate on headless system.
+  -v/--verbose : prints command before running them
+  -n/--dry     : dry run, do not execute commands. Implies --verbose.
+"
+}
+
+function exit_error() {
+	print_help
+	exit 1
+}
+
+
+GNOME=false
+VERBOSE=false
+DRY=false
+
+function set_gnome_on() {
+	GNOME=true
+}
+function set_verbose_on() {
+	VERBOSE=true
+}
+
+function set_dry_on() {
+	DRY=true
+	VERBOSE=true
+}
+
+while getopts "vnhg-:" optchar
+do
+	case "${optchar}" in
+		-)
+			case "${OPTARG}" in
+				gnome)
+					set_gnome_on
+					;;
+				verbose)
+					set_verbose_on
+					;;
+				dry)
+					set_dry_on
+					;;
+				*)
+					echo "invalid argument --${OPTARG}"
+					exit_error
+					;;
+			esac;;
+		h)
+			print_help
+			exit 0
+			;;
+		g)
+			set_gnome_on
+			;;
+		n)
+			set_dry_on
+			;;
+		v)
+			set_verbose_on
+			;;
+		*)
+			exit_error
+			;;
+	esac
+done
+
 
 files=".config/fish \
 .config/git \
@@ -12,16 +86,44 @@ files=".config/fish \
 .tmux.conf.local"
 
 
+
+
 function this_script_root_dir() {
 	dirname $(realpath ${BASH_SOURCE[0]})
 }
 
 function run() {
-#	echo "$@"
-	$@
+	if $VERBOSE
+	then
+		echo "[$@]"
+	fi
+	if ! $DRY
+	then
+	   $@
+	fi
 }
 
+function run_git() {
+	if $VERBOSE
+	then
+	   echo "[git $@] in $(this_script_root_dir)"
+	fi
+	if ! $DRY
+	then
+		pushd $(this_script_root_dir) 1>/dev/null
+		if $VERBOSE
+		then
+			git $@
+		else
+			git $@ 1>/dev/null
+		fi
+		popd 1>/dev/null
+	fi
+}
+
+
 function load_gnome_terminal_profiles() {
+	echo "--- Installing GNOME terminal profile"
 	if which dconf 1>/dev/null
 	then
 		run dconf load /org/gnome/terminal/legacy/profiles:/ < $(this_script_root_dir)/gnome-terminal-profiles.dconf
@@ -29,64 +131,68 @@ function load_gnome_terminal_profiles() {
 }
 
 function use_fish() {
+	echo "--- Ensuring fish is current shell"
     if ! which fish 1>/dev/null
     then
-		echo "Installing fish"
+		echo "+++ Installing fish"
 		run sudo apt-get install -y fish
 	else
-		echo "Fish is installed"
+		echo "+++ Fish is installed"
     fi
 
     fish=$(which fish)
     current_shell=$(grep $USER /etc/passwd | cut -d ":" -f 7)
     if [ $current_shell != $fish ]
     then
-		echo "Changing shell to $fish (you will be prompted for passwd)"
+		echo "+++ Changing shell to $fish (you will be prompted for passwd)"
 		run chsh -s $fish
 	else
-		echo "Default shell is $fish"
+		echo "+++ Default shell is $fish"
     fi
 }
 
 function use_direnv() {
+	echo "--- Ensuring direnv is installed"
     if ! which direnv 1>/dev/null
     then
-		echo "Installing direnv"
+		echo "++ Installing direnv"
 		run sudo apt-get install -y direnv
 	else
-		echo "direnv is installed"
+		echo "+++ direnv is installed"
     fi
 }
 
 function use_starship() {
+	echo "--- Ensuring starship is installed"
     if ! which starship 1>/dev/null
     then
-		echo "Installing starship"
+		echo "+++ Installing starship"
 		run curl -sS https://starship.rs/install.sh | sh
 	else
-		echo "Starship is installed"
+		echo "+++ Starship is installed"
     fi
 }
 
 function install_ubuntu_mono_nerd() {
+	echo "--- Ensuring UbuntuMono Nerd font is present"
     if ! fc-list | grep "UbuntuMono Nerd" 1>/dev/null
     then
 		pushd /tmp
 		run wget https://github.com/ryanoasis/nerd-fonts/releases/download/v2.1.0/UbuntuMono.zip
 		run unzip UbuntuMono.zip
 		run mkdir -p ~/.local/share/fonts
-		cp *.ttf ~/.local/share/fonts/
+		run cp *.ttf ~/.local/share/fonts/
 		run fc-cache -f
 		popd
 	else
-		echo "UbuntuMono Nerd font is installed"
+		echo "+++ UbuntuMono Nerd font is installed"
     fi
 
 	if [ ! -e /usr/share/terminfo/x/xterm-direct ]
 	then
 		run sudo apt-get install -y ncurses-term
 	else
-		echo "xterm-direct is in terminfo database"
+		echo "+++ xterm-direct is in terminfo database"
 	fi
 }
 
@@ -94,12 +200,14 @@ function install_deps() {
     use_fish
     use_direnv
     use_starship
-    install_ubuntu_mono_nerd
+	if $GNOME
+	then
+		install_ubuntu_mono_nerd
+	fi
 }
 
-
-function install_home() {
-    install_deps
+function install_files() {
+	echo "--- Ensuring symlinks to git file are present"
 	for f in $files
 	do
 		run rm -Rf $HOME/$f
@@ -111,16 +219,45 @@ function install_home() {
 		run ln -sf $(this_script_root_dir)/$f $HOME/$f
 	done
 	run ln -sf $(this_script_root_dir)/.tmux/.tmux.conf $HOME/.tmux.conf
-	load_gnome_terminal_profiles
-	/usr/bin/fish -c 'omf install'
 }
 
+function update_oh_my_fish() {
+	echo "--- Updating Oh My Fish"
+	if $VERBOSE
+	then
+	   echo "[/usr/bin/fish -c 'omf install']"
+	fi
+	if ! $DRY
+	then
+		if $VERBOSE
+		then
+			/usr/bin/fish -c 'omf install'
+		else
+			/usr/bin/fish -c 'omf install' 1>/dev/null
+		fi
+	fi
+}
 
-pushd $(this_script_root_dir) 1>/dev/null
-echo "Updating git.tuleu.science:atuleu/home.git"
-git pull 1>/dev/null
-git submodule init 1>/dev/null
-git submodule update 1>/dev/null
-popd 1>/dev/null
-install_home
-echo "git.tuleu.science:atuleu/home.git updated and set"
+function update_home() {
+	update_repos
+    install_deps
+	install_files
+	update_oh_my_fish
+	if $GNOME
+	then
+		load_gnome_terminal_profiles
+	fi
+	if ! $DRY
+	then
+	   echo "--- git.tuleu.science:atuleu/home.git updated and set"
+	fi
+}
+
+function update_repos() {
+	echo "--- Updating git.tuleu.science:atuleu/home.git"
+	run_git pull
+	run_git submodule init
+	run_git submodule update
+}
+
+update_home