Good idea! But I think it needs more ranges:
The format call can be substituted with writefln directly: void main(string[] args) { import std.algorithm, std.format, std.stdio; enum cols = 16; args[1].File("rb").byChunk(16).each!(chunk => writefln!"%(%02X %)%*s %s"( chunk, 3 * (cols - chunk.length), "", chunk.map!(c => c < 0x20 || c > 0x7E ? '.' : char(c)))); }