Curl Upd — Download If Not Exists

: It checks for the local file's existence before initiating the connection. If the file is present, curl skips the transfer entirely.

This method is reliable for automation and works on almost all Unix-like systems without requiring the latest curl updates. Method 3: Conditional Downloads Based on Time Unix & Linux Stack Exchange curl download if not exists

FILE="data.zip" URL="https://example.com" if [ ! -f "$FILE" ]; then curl -o "$FILE" "$URL" else echo "File already exists. Skipping download." fi Use code with caution. : It checks for the local file's existence