1、新系统在输入命令时，不会自动提示，按上箭头（↑）和下向下箭头（↓）不会匹配之前的输入
以CentOS 为例，可以通过配置 ~/.bashrc 文件来实现按向上箭头显示最相近的命令。以下是具体的实现步骤
vi ~/.bashrc
# 在文件末尾添加一下内容
# 命令历史设置
bind '"\e[A": history-search-backward'
bind '"\e[B": history-search-forward'
# 刷新
source ~/.bashrc
2、centos6.10 更新yum镜像源
备份原来的源
mkdir /root/opt
mv /etc/yum.repos.d/* /root/opt/
创建新的源
vi /etc/yum.repos.d/CentOS-Base.repo
把以下内容复制到新的源文件中
[base]
name=CentOS-$releasever - Base
baseurl=http://mirrors.aliyun.com/centos-vault/6.10/os/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os
gpgcheck=1
enabled=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6
#released updates
[updates]
name=CentOS-$releasever - Updates
baseurl=http://mirrors.aliyun.com/centos-vault/6.10/updates/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates
gpgcheck=1
enabled=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6
清除原来的源
yum clean all
编译新的源
yum makecache
成功
3、升级git
一般情况下直接用yum install git 就可以了，但是yum装的版本还是低的话，那就只能自己装了
# 下载
wget https://github.com/git/git/archive/v2.3.0.zip --no-check-certificate
# 解压
unzip v2.3.0.zip
cd git-2.3.0
make prefix=/usr/local/git all
make prefix=/usr/local/git install
# 修改环境变量
vi ~/.bashrc
export PATH=/usr/local/git/bin:$PATH
source ~/.bashrc