# expac > A data extraction tool for alpm databases, offering printf-like flexibility for pacman-based utilities. > See also: `pacman`. > More information: . - List the dependencies of a package: `expac {{[-S|--sync]}} '%D' {{package}}` - List the optional dependencies of a package: `expac {{[-S|--sync]}} "%o" {{package}}` - List the download size of packages in MiB: `expac {{[-S|--sync]}} {{[-H|--humansize]}} M '%k\t%n' {{package1 package2 ...}}` - List packages marked for upgrade with their download size: `expac {{[-S|--sync]}} {{[-H|--humansize]}} M '%k\t%n' $(pacman -Qqu) | sort {{[-sh|--sort --human-numeric-sort]}}` - List explicitly-installed packages with their optional dependencies: `expac {{[-d|--delim]}} '\n\n' {{[-l|listdelim]}} '\n\t' {{[-Q|--query]}} '%n\n\t%O' $(pacman -Qeq)`