initial commit

bash/error-handling/error_handling.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+#
+# Note: I don't like the test on empty arg or whitespaces only arg:
+# 'error_handling.sh ""' and 'error_handling.sh "  "'
+# should be faulty, instead of displaying a strange message ("Hello, ")
+usage() {
+    echo "Usage: ./error_handling <greetee>"
+    exit 1
+}
+(( $# != 1 )) && usage
+
+echo "Hello, $1"