关于while循环会被adb shell中断的问题

echo "" > mac.txt
adb disconnect
while read line; do
    echo "[ + ] Connecting $line"
    adb connect $line
    mac=$(adb -s  $line shell -n ifconfig eth0 | grep HWaddr | awk '{print $5}')
    echo "mac:$mac"
    echo $mac >> mac.txt
done < host.txt

上面的代码，如果shell执行不加-n参数，则循环执行一次就会被中断。

shell各参数意义：

shell:
 shell [-e ESCAPE] [-n] [-Tt] [-x] [COMMAND...]
     run remote shell command (interactive shell if no command given
     -e: choose escape character, or "none"; default '~'
     -n: don't read from stdin
     -T: disable pty allocation
     -t: allocate a pty if on a tty (-tt: force pty allocation)
     -x: disable remote exit codes and stdout/stderr separation