#!/bin/bash # Script: download_deps.sh # Purpose: Download all dependencies for offline installation set -euo pipefail # Strict mode DEP_DIR="./offline-deps" PYTHON_DEP_DIR="$DEP_DIR/wheels" BINARY_URL="https://github.com/example/cli-tool/releases/download/v1.2.3/cli-tool-linux-amd64" BINARY_NAME="cli-tool" 1. Create directories mkdir -p "$PYTHON_DEP_DIR" 2. Download Python wheels (for offline pip install) pip download -r requirements.txt -d "$PYTHON_DEP_DIR" 3. Download binary with checksum verification echo "Downloading $BINARY_NAME..." curl -L -o "$DEP_DIR/$BINARY_NAME" "$BINARY_URL" curl -L -o "$DEP_DIR/$BINARY_NAME.sha256" "$BINARY_URL.sha256" 4. Verify checksum cd "$DEP_DIR" sha256sum -c "$BINARY_NAME.sha256" cd - 5. Optional: Download system packages for offline installation (for Debian/Ubuntu) while read pkg; do apt download "$pkg" -o Dir::Cache::Archives="$DEP_DIR" done < system_packages.txt
Even in these advanced systems, the primitive of "shell dep download" persists because the shell is the universal control plane. The phrase "shell dep download" may seem simple, but it encompasses a rich ecosystem of tools, best practices, and security measures. Whether you’re a beginner writing your first install.sh or a senior architect designing a hermetic build system, your ability to reliably download dependencies via the shell is a critical skill.
aria2c -x 16 -s 16 https://example.com/large-dep.zip Let's build a practical example. Imagine you have a Python project with dependencies listed in requirements.txt and a custom binary from GitHub. Here's a shell script that performs a complete "shell dep download": shell dep download
echo "All dependencies downloaded to $DEP_DIR"
cat urls.txt | xargs -P 10 -n 1 curl -O To avoid re-downloading the same dependency multiple times, set up a local cache mirror: The phrase "shell dep download" may seem simple,
firejail --net=wget https://untrusted-repo.com/dep.sh Instead of curl <url> | bash , download first, inspect, then execute:
Tools like (GitHub) and renovate automate dependency updates, but they still rely on shell commands under the hood. Moreover, Nix and Guix bring functional package management, where nix-shell downloads and isolates dependencies declaratively. system_packages.txt Even in these advanced systems
curl -L -o dep.tar.gz https://github.com/user/repo/releases/latest/dep.tar.gz For downloading and installing OS-level dependencies from repositories.