update

hosts.sh

@@ -0,0 +1,18 @@
+#!/bin/sh
+
+# List the concrete destinations defined by the user's SSH configuration.
+
+hosts() {
+	if [ ! -r "$HOME/.ssh/config.d/hosts.conf" ]; then
+		printf '%s\n' 'SSH host configuration is unavailable.' >&2
+		return 1
+	fi
+
+	awk '
+		tolower($1) == "host" {
+			for (field = 2; field <= NF; field++) {
+				if ($field !~ /[*?!]/) print $field
+			}
+		}
+	' "$HOME/.ssh/config.d/hosts.conf"
+}