CentOS初始化脚本（未完）

#!/bin/bash
release=`grep -o "<[[:digit:]]>" /etc/centos-release | head -1`

# 1、shutdown selinux
[ -e "/etc/selinux/config" ] && sed -i 's@^SELINUX=.*@SELINUX=disabled@' /etc/selinux/config
setenforce 0 &> /dev/null

# 2、shudown firewall
[ $release = "6" ] && service iptables stop && chkconfig iptables off
[ $release = "7" ] && systemctl stop firewalld && systemctl disable firewalld

# 3、set own alias
echo "alias cdnet='cd /etc/sysconfig/network-scripts/'" >> /etc/profile.d/myalias.sh
source /etc/profile.d/myalias.sh

# 4、set evironment "PS1 color"
# 30:black, 31:red, 32:green, 33:yellow, 34:blue, 35:pink, 36:cyan, 37:white
ps1_color=35
echo 'PS1="[e[1;'''${ps1_color}'''m][u@h w]$[e[0m]"' >> /etc/profile.d/evironment.sh
source /etc/profile.d/myalias.sh

# 5、set aliyun repo
rpm -q wget &> /dev/null || yum -y install wget
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
[ $release = "6" ] && wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo
[ $release = "7" ] && wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo           yum makecache &> /dev/null

注意：请使用source命令执行此脚本。为什么？

　　1、source执行某个脚本，会影响当前bash的参数，所以要调用某些变量的时候可以采用此方法

 　　2、/bin/bash执行某个脚本，脚本会在子shell中运行，当前bash参数