vi(vim)指令：
顯示行數：:set nu
不顯示行數：:set nonu
刪除一整行：dd
到第一行：gg
到最後一行：G
到某一行：xxG
IP：
查看：ifconfig
修改：netconfig、system-config-network-tui（或修改此檔：/etc/sysconfig/network-scripts/ifcfg-eth0）
FQDN 設定：
hostname
vi /etc/hosts
vi /etc/sysconfig/network
DNS 設定：
vi /etc/resolv.conf
重新啟動網卡：
/etc/rc.d/init.d/network restart
runlevel
vi /etc/inittab
netstat
netstat -tl
netstat -pan|more
cd /etc/yum.repos.d/
cp CentOS-Base.repo CentOS-Base.repo.bak
vi CentOS-Base.repo
[base]
name=CentOS-$releasever - Base
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os
baseurl=http://ftp.isu.edu.tw/pub/Linux/CentOS/$releasever/os/$basearch/
gpgcheck=1
gpgkey=http://ftp.isu.edu.tw/pub/Linux/CentOS/RPM-GPG-KEY-centos4#released updates
[update]
name=CentOS-$releasever - Updates
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates
baseurl=http://ftp.isu.edu.tw/pub/Linux/CentOS/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=http://ftp.isu.edu.tw/pub/Linux/CentOS/RPM-GPG-KEY-centos4#packages used/produced in the build but not released
#additional packages that may be useful
[addons]
name=CentOS-$releasever - Addons
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=addons
baseurl=http://ftp.isu.edu.tw/pub/Linux/CentOS/$releasever/addons/$basearch/
gpgcheck=1
gpgkey=http://ftp.isu.edu.tw/pub/Linux/CentOS/RPM-GPG-KEY-centos4
[extras]
name=CentOS-$releasever - Extras
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras
baseurl=http://ftp.isu.edu.tw/pub/Linux/CentOS/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=http://ftp.isu.edu.tw/pub/Linux/CentOS/RPM-GPG-KEY-centos4
yum指令
yum -y update
yum -y install XXX
php.ini ：
vi /etc/php.ini
244行 max_execution_time = 300
245行 max_input_time = 600
246行 memory_limit = 80M
388行 post_max_size = 80M
501行 upload_max_filesize = 20M
校時：
cp /etc/crontab /etc/crontab.bak
vi /etc/crontab
0 0-23 * * * root /usr/sbin/ntpdate watch.stdtime.gov.tw > /dev/null 2>&1
