更新（随便更新喽，可能用到的东西都更新下）

yum -y install bzip2-devel curl-devel db4-devel libjpeg-devel libpng-devel freetype-devel
yum -y install libXpm-devel gmp-devel libc-client-devel openldap-devel unixODBC-devel 
yum -y install postgresql-devel sqlite-devel aspell-devel net-snmp-devel libxslt-devel 
yum -y install libxml2-devel pcre-devel mysql-devel pspell-devel 
yum- y install libmemcached libmemcached-devel zlib-devel 
yum -y install xinetd telnet telnet-server gcc cmake vim wget lrzsz tree zip unzip
yum -y update

ssh登录端口，修改后就用2222登录呗

echo 'Port 2222' >> /etc/ssh/sshd_config

关闭postfix 不知道干嘛用，用25端口看着烦

netstat -lntp
service postfix stop
netstat -lntp
chkconfig --list | grep postfix
chkconfig postfix off
chkconfig --list | grep postfix

查看系统版本

cat /etc/redhat-release

head -n 1 /etc/issue

查看系统内核

cat /proc/version

uname -a

查看是否有硬盘

df -h

查看系统时间和同步互联网时间

date

查看系统版本[影响解析json格式]，不知道是不是真的

vim /etc/sysconfig/i18n

修改为

LANG="zh_CN.UTF-8"
SYSFONT="latarcyrheb-sun16"

source /etc/sysconfig/i18n