From 7d593e6c6158da158720746ba0fc4f394f37e6a6 Mon Sep 17 00:00:00 2001
From: Michael Vines <mvines@gmail.com>
Date: Wed, 13 Mar 2019 20:56:47 -0700
Subject: [PATCH] Exit gracefully when no subcommand is specified

---
 wallet/src/main.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/wallet/src/main.rs b/wallet/src/main.rs
index d9d189b16d..c5de0afde1 100644
--- a/wallet/src/main.rs
+++ b/wallet/src/main.rs
@@ -1,5 +1,6 @@
 use clap::{
-    crate_description, crate_name, crate_version, App, Arg, ArgGroup, ArgMatches, SubCommand,
+    crate_description, crate_name, crate_version, App, AppSettings, Arg, ArgGroup, ArgMatches,
+    SubCommand,
 };
 use solana_sdk::signature::{gen_keypair_file, read_keypair, KeypairUtil};
 use solana_wallet::wallet::{parse_command, process_command, WalletConfig, WalletError};
@@ -93,6 +94,7 @@ fn main() -> Result<(), Box<dyn error::Error>> {
     let matches = App::new(crate_name!())
         .about(crate_description!())
         .version(crate_version!())
+        .setting(AppSettings::ArgRequiredElseHelp)
         .arg(
             Arg::with_name("host")
                 .short("n")