update

Task/Sierpinski-carpet/UNIX-Shell/sierpinski-carpet.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+next() {
+    block="$1"
+    center="$(echo "$1" | tr '#' ' ')"
+    paste -d '' <(echo "$block") <(echo "$block" ) <(echo "$block")
+    paste -d '' <(echo "$block") <(echo "$center") <(echo "$block")
+    paste -d '' <(echo "$block") <(echo "$block" ) <(echo "$block")
+}
+
+carpet="#"
+for _ in {1..3}
+do
+  carpet="$(next "$carpet")"
+done
+
+echo "$carpet"