install script

install.sh

@@ -0,0 +1,36 @@
+#!/usr/bin/env sh
+set -e
+
+OS=$(uname -s | tr 'A-Z' 'a-z')
+[ "$OS" = linux ] || [ "$OS" = darwin ] || {
+	echo "Unsupported OS: $OS" >&2; exit 1;
+}
+
+# 2) Arch detection
+ARCH=$(uname -m)
+case "$ARCH" in
+	x86_64)
+		ARCH=amd64
+		;;
+	aarch64|arm64)
+		ARCH=arm64
+		;;
+	*)
+		echo "Unsupported architecture: $ARCH" >&2
+		exit 1
+		;;
+esac
+
+VERSION=$(curl -sL https://api.github.com/repos/coalaura/up/releases/latest | grep -Po '"tag_name": *"\K.*?(?=")')
+
+if ! printf '%s\n' "$VERSION" | grep -Eq '^v[0-9]+\.[0-9]+\.[0-9]+$'; then
+	echo "Error: '$VERSION' is not in vMAJOR.MINOR.PATCH format" >&2
+	exit 1
+fi
+
+curl -sL "https://github.com/coalaura/up/releases/download/${VERSION}/up_${VERSION}_${OS}_${ARCH}" -o up \
+  && chmod +x up \
+  && install -m755 up /usr/local/bin/up \
+  && rm up
+
+echo "up ${VERSION} installed to /usr/local/bin/up"