From 4153a4571a607e6ef5da48ff7a6ea277b9832239 Mon Sep 17 00:00:00 2001
From: yabu76 <yabu76@gmail.com>
Date: Sun, 15 Feb 2026 17:20:24 +0900
Subject: [PATCH] Add guide message to ctrl-t R interactive shell command
 execution

---
 src/tty.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/tty.c b/src/tty.c
index 3eee2b7..374a402 100644
--- a/src/tty.c
+++ b/src/tty.c
@@ -558,15 +558,17 @@ void *tty_stdin_input_thread(void *arg)
                             tio_printf("Flushed data I/O buffers");
                             tcflush(device_fd, TCIOFLUSH);
                             break;
-#if defined(__linux__)
                         case KEY_SHIFT_R:
                             if (state == STATE_EXEC_SHELL_COMMAND)
                             {
+#if defined(__linux__)
                                 tio_printf("Terminated shell command");
                                 terminate_shell_command();
+#else
+                                tio_warning_printf("The previous command is still running");
+#endif
                             }
                             break;
-#endif
                         default:
                             break;
                     }
@@ -1390,7 +1392,7 @@ void handle_command_sequence(char input_char, char *output_char, bool *forward)
             case KEY_SHIFT_R:
                 /* Execute shell command */
                 tio_printf("Execute shell command with I/O redirected to device");
-                if (tio_subcmd_readln("Enter command: "))
+                if (tio_subcmd_readln("Enter command (\"?\" prefix prevents redirection of stderr): "))
                 {
                     state_t state_orig = state;
                     state = STATE_EXEC_SHELL_COMMAND;