initial commit

bash/raindrops/raindrops.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+function usage() {
+    echo "Usage: ./raindrop.sh number"
+    exit 1
+}
+
+shopt -s extglob
+
+(( $# == 1 )) || usage
+number="$1"
+[[ "$number" == +([0-9]) ]] || usage
+
+output=""
+(( $number % 3 )) || output+="Pling"
+(( $number % 5 )) || output+="Plang"
+(( $number % 7 )) || output+="Plong"
+
+echo ${output:-$number}
+exit 0