Solution to secret handshake in Bash

bash/secret-handshake/secret_handshake.sh

@@ -0,0 +1,40 @@
+#!/usr/bin/env bash
+
+# Read the number from the user
+number=$1
+
+binary=""
+while ((number > 0)); do
+    remainder=$((number % 2))
+    binary="$remainder$binary"
+    number=$((number / 2))
+done
+binary=$(printf "%05d" "$binary")
+
+# Initialize an empty array to store the actions
+actions=()
+
+# Check the rightmost five digits of the binary number
+# and add corresponding actions to the array
+if [[ ${binary:4:1} == "1" ]]; then
+    actions+=("wink")
+fi
+if [[ ${binary:3:1} == "1" ]]; then
+    actions+=("double blink")
+fi
+if [[ ${binary:2:1} == "1" ]]; then
+    actions+=("close your eyes")
+fi
+if [[ ${binary:1:1} == "1" ]]; then
+    actions+=("jump")
+fi
+if [[ ${binary:0:1} == "1" ]]; then
+    # reverse actions
+    for ((i = ${#actions[@]} - 1; i >= 0; i--)); do
+      rev+=("${actions[i]}")
+    done
+    actions=("${rev[@]}")
+fi
+
+# Add a comma between actions
+echo "$(IFS=, ; echo "${actions[*]}")"