linux开机自动执行命令或自动启动程序（rc.local）

linux开机的最后会执行/etc/rc.local，因此可以在此脚本里面添加shell命令自动执行或者自动启动某个进程。
比如

#!/bin/sh -e
#
# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
# By default this script does nothing.

echo "hello world!"

exit 0

#!/bin/sh -e
#
# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
# By default this script does nothing.

/usr/local/bin/gen-friendlyelec-release   #执行程序
. /etc/friendlyelec-release               #执行程序
if [ ! -f /etc/firstuse ]; then           #-f作用是判断/etc/firstuse是否为一般文件 !作用是取反
    /bin/echo ${BOARD} > /etc/hostname
    /bin/sed -i "s/(127.0.1.1s*).*/1${BOARD}/g" /etc/hosts
    /bin/hostname ${BOARD}
    /bin/echo "0" > /etc/firstuse
fi

if [ -e /usr/bin/setqtenv ]; then         #-e作用是判断/usr/bin/setqtenv是否存在  
. /usr/bin/setqtenv
/usr/bin/lcd2usb_print "CPU: {{CPU}}" "Mem: {{MEM}}" "IP: {{IP}}" "LoadAvg: {{LOADAVG}}" 2>&1 > /dev/null&
#/opt/QtE-Demo/run.sh&
fi

exit 0

#!/bin/sh

sh /etc/init.d/S100auto_wifi_link.sh
echo "wifi finish!!"