Now redis-cli replies to help showing some basic usage information (Issue 291)

src/redis-cli.c

@@ -251,12 +251,32 @@ static int selectDb(int fd) {
     return 0;
 }
 
+static void showInteractiveHelp(void) {
+    printf(
+    "\n"
+    "Welcome to redis-cli " REDIS_VERSION "!\n"
+    "Just type any valid Redis command to see a pretty printed output.\n"
+    "\n"
+    "It is possible to quote strings, like in:\n"
+    "  set \"my key\" \"some string \\xff\\n\"\n"
+    "\n"
+    "You can find a list of valid Redis commands at\n"
+    "  http://code.google.com/p/redis/wiki/CommandReference\n"
+    "\n"
+    "Note: redis-cli supports line editing, use up/down arrows for history."
+    "\n\n");
+}
+
 static int cliSendCommand(int argc, char **argv, int repeat) {
     char *command = argv[0];
     int fd, j, retval = 0;
     sds cmd;
 
     config.raw_output = !strcasecmp(command,"info");
+    if (!strcasecmp(command,"help")) {
+        showInteractiveHelp();
+        return 0;
+    }
     if (!strcasecmp(command,"shutdown")) config.shutdown = 1;
     if (!strcasecmp(command,"monitor")) config.monitor_mode = 1;
     if (!strcasecmp(command,"subscribe") ||