diff --git a/setup.sh b/setup.sh
index 6b617f8..489cbba 100755
--- a/setup.sh
+++ b/setup.sh
@@ -1,23 +1,18 @@
 #!/bin/bash
 
+export PATH=$PATH:$HOME/.local/bin
+
 # starship
-mkdir -p $HOME/.local/bin && curl -sS https://starship.rs/install.sh | sudo -E sh -s -- --yes --bin-dir $HOME/.local/bin
+command -v starship &> /dev/null || mkdir -p $HOME/.local/bin && curl -sS https://starship.rs/install.sh | sudo -E sh -s -- --yes --bin-dir $HOME/.local/bin
 
 # pfetch
-curl -L https://github.com/Gobidev/pfetch-rs/releases/latest/download/pfetch-linux-gnu-x86_64.tar.gz | sudo tar -xvz -C /usr/local/bin/
+command -v pfetch &> /dev/null || curl -L https://github.com/Gobidev/pfetch-rs/releases/latest/download/pfetch-linux-gnu-x86_64.tar.gz | sudo tar -xvz -C $HOME/.local/bin
 
 # Go
 sudo rm -rf /usr/local/go || sudo mkdir -p /usr/local/go && curl -L https://go.dev/dl/go1.20.5.linux-amd64.tar.gz | sudo tar -xvz -C /usr/local/
-go install github.com/gopherdata/gophernotes@v0.7.5
-mkdir -p ~/.local/share/jupyter/kernels/gophernotes
-cd ~/.local/share/jupyter/kernels/gophernotes
-cp "$(go env GOPATH)"/pkg/mod/github.com/gopherdata/gophernotes@v0.7.5/kernel/*.json.in "."
-chmod +w ./kernel.json* # in case copied kernel.json has no write permission
-sed "s|gophernotes|$(go env GOPATH)/bin/gophernotes|" < kernel.json.in > kernel.json
-cd ~/
 
 # kubectl
-sudo curl -o /usr/local/bin/kubectl -L "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl" && sudo chmod +x /usr/local/bin/kubectl
+command -v kubectl &> /dev/null || sudo curl -o /usr/local/bin/kubectl -L "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl" && sudo chmod +x /usr/local/bin/kubectl
 
 # dotnet
 curl -L https://dot.net/v1/dotnet-install.sh | sudo bash -s -- --channel LTS --install-dir /usr/local/dotnet