Initial data commit

Task/Anonymous-recursion/UNIX-Shell/anonymous-recursion-1.sh

@@ -0,0 +1,17 @@
+fib() {
+  if test 0 -gt "$1"; then
+    echo "fib: fib of negative" 1>&2
+    return 1
+  else
+    (
+      fib2() {
+        if test 2 -gt "$1"; then
+          echo "$1"
+        else
+          echo $(( $(fib2 $(($1 - 1)) ) + $(fib2 $(($1 - 2)) ) ))
+        fi
+      }
+      fib2 "$1"
+    )
+  fi
+}