From f290099ea3f130fad20e44366c639e0704505957 Mon Sep 17 00:00:00 2001
From: Molly Lau <windowsbeta@outlook.com>
Date: Tue, 24 Oct 2023 20:10:00 +0900
Subject: [PATCH] Update alpineInit.sh

---
 Linux_reinstall/Alpine/alpineInit.sh | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/Linux_reinstall/Alpine/alpineInit.sh b/Linux_reinstall/Alpine/alpineInit.sh
index 486d836..3e8ddfe 100644
--- a/Linux_reinstall/Alpine/alpineInit.sh
+++ b/Linux_reinstall/Alpine/alpineInit.sh
@@ -2,9 +2,15 @@
 #
 # Alpine Linux use "ash" as the default shell.
 
-exec >/dev/tty0 2>&1
-exec >/dev/ttyS0 2>&1
-exec >/dev/ttyAMA0 2>&1
+# Find available tty.
+# Parameters of outputs of "stty": https://www.ibm.com/docs/en/aix/7.3?topic=s-stty-command
+for ttyItems in "/dev/tty0" "/dev/ttyS0" "/dev/ttyAMA0"; do
+	ttyAttribute=$(stty -F "$ttyItems")
+	[[ -n "$ttyAttribute" && -n $(echo "$ttyAttribute" | grep -io "\-brkint ixoff \-imaxbel") ]] && {
+		break
+	}
+done
+exec >"$ttyItems" 2>&1
 
 insertIntoFile() {
 	file=$1