http://jackxiang.com/index.php zh-cn http://jackxiang.com/post// jack <xdy108@126.com> Sun, 28 Jun 2015 07:25:02 +0000 http://jackxiang.com/post// 实践如下：
vi /etc/rc.local
/usr/bin/php /var/www/initOuterInterfaceCheck.php
initOuterInterfaceCheck.php
<?php $voicePath="/var/www/voice/";//播放声音目录 $command = "/sbin/adb devices"; //电话号码可修改,防止手机丢了。 $handle = popen($command, "r"); $excuteResultAll = ""; do {         $excuteResult = fread($handle, 1024);         if (strlen($excuteResult) == 0) {             pclose($handle); //关闭pipe             break;         }         $excuteResultAll .= $excuteResult; } while (true); $adbDevicesArrInfo = explode("\n",$excuteResultAll); if(empty($adbDevicesArrInfo[1])){//如果没有设备，就提示用户插上手机即可。         $command = "mplayer ".$voicePath."initMobileBad.m4a "; //电话号码可修改,防止手机丢了。         $handle = popen($command, "r");         $excuteResultAll = "";         do {                 $excuteResult = fread($handle, 1024);                 if (strlen($excuteResult) == 0) {                     pclose($handle); //关闭pipe                     break;                 }                 $excuteResultAll .= $excuteResult;         } while (true); }else{//识别到手机设备         $command = "mplayer ".$voicePath."initMobileOk.m4a "; //电话号码可修改,防止手机丢了。         $handle = popen($command, "r");         $excuteResultAll = "";         do {                 $excuteResult = fread($handle, 1024);                 if (strlen($excuteResult) == 0) {                     pclose($handle); //关闭pipe                     break;                 }                 $excuteResultAll .= $excuteResult;         } while (true); } ?>
发现是代码有问题，开机后，的确是执行了，但是发现手机没插入，但报检测到手机了~
要让Pi开机启动一个脚本/执行一个命令怎么办？
我们知道，RedHat有 /etc/rc.local 文件，在里面写上要执行的命令就可以开机执行了，这是最简单的办法，而Arch Linux ARM没有这个东西，它是按下面的方法设置的：
假设我要开机执行一句shell命令，把它写在文件 /etc/rc.local 中（在Arch Linux中，此文件一开始是不存在的）：
How to execute a shell script/a command on Pi startup?
For RedHat it's very easy, it has a /etc/rc.local file, we just add the commands to the file, while Arch Linux ARM doesn't have such thing, and I'm a beginner of Arch, so after asking Google for many times, I find a way to do that - suppose I need to execute a shell command, so I create the /etc/rc.local file & write the shell command to it:

#!/bin/bash
# this file defines the commands that will be executed at system startup

echo "abc" > /root/test.txt
为此文件赋予可执行权限：
Give the file the executable permission:

1
chmod +x /etc/rc.local
然后创建一个文件 /usr/lib/systemd/system/rc-local.service ，内容为：
Then create a file /usr/lib/systemd/system/rc-local.service , with the content of:

[Unit]
Description=/etc/rc.local Compatibility
ConditionPathExists=/etc/rc.local
  
[Service]
Type=forking
ExecStart=/etc/rc.local start
TimeoutSec=0
StandardOutput=tty
RemainAfterExit=yes
SysVStartPriority=99

[Install]
WantedBy=multi-user.target
文章来源：http://www.codelast.com/
创建一个软链接：
Create a symbol link:

cd /etc/systemd/system/multi-user.target.wants
ln -s /usr/lib/systemd/system/rc-local.service rc-local.service
启用服务：
Enable the service:

systemctl enable rc-local.service
重启系统，然后就可以开机执行你的shell命令了。如果要立即启用，则执行以下命令：
Restart Pi, then you'll be able to execute the shell command on OS startup. If you want to execute it without restarting Pi, just execute the following command:

systemctl start rc-local.service
这是使用systemd的启动方式，非常麻烦。
如果你只是简单地要设置一个命令的别名，可以把命令写在 /etc/profile 中，ssh登录Pi的时候就自动会执行。

摘自：http://www.codelast.com/?p=4945 ]]> http://jackxiang.com/post//#blogcomment <user@domain.com> Thu, 01 Jan 1970 00:00:00 +0000 http://jackxiang.com/post//#blogcomment