/etc/auto_master nfs 配置文件，用来保存自动mount 其他机器的贡献资源， 这个文件提供系统命令automount
/etc/cdromd.conf Defines for the cdromd daemon the managed devices and supported file system types.
/etc/cronlog.conf 针对用户定义cron定时任务日志格式及存放目录
/etc/csh.cshrc
/etc/csh.login
/etc/exclude.rootvg 定义在备份的时候那些文件不进行备份
/etc/exports nfs 对外提供的文件系统列表
/etc/environment 记录系统启动时的路径，这里只能是 var=val 格式，不支持shell
/etc/exports Contains a list of directories that can be exported to Network File System (NFS) clients.
/etc/dhcpcd.ini dbcp
/etc/dhcprd.cnf
/etc/dhcpsd.cnf
/etc/dhcpv6
/etc/filesystems 定义系统内存在的文件系统及其默认行为、属性
/etc/gated.conf Contains configuration information for the gated daemon.
gated Provides gateway routing functions for the RIP, RIPng, EGP, BGP, BGP4+,
HELLO, IS-IS, ICMP, ICMPv6, and SNMP protocols.
/etc/groups Contains the basic attributes of groups.
/etc/hosts 定义主机和ip对应关系
/etc/hosts.equiv 根据主机名+用户 和主机名+组 定义访问控制（第一个访问$HOME/.rhosts，第二个hosts.equiv，第三个hosts.lpd）
/etc/hosts.lpd 类似hosts.equiv
/etc/inittab 定义系统启动行为，这里的条目都会在系统启动时执行
/etc/inetd.conf 定义demoan配置，定义后如果有程序访问制定端口，inetd会启动相应服务
/etc/irs.conf 系统名称 解析顺序定义文件优先权小于/etc/netsvc.conf
/etc/locks Contains lock files that prevent multiple uses of communications devices and multiple calls to remote systems.
/etc/magic The /etc/magic file is used by commands such as the following to determine the type of a given file:
/etc/motd 登陆时，系统显示的提示信息
/etc/netsvc.conf The /etc/netsvc.conf file is used to specify the ordering of name resolution，名字解析顺序
/etc/nfs.clean
/etc/ntp.conf 网络时钟服务器
/etc/objrepos odm 数据库 存储目录
/etc/pam.conf Contains service entries for each PAM (Pluggable Authentication Modules)
/etc/rc.tcpip 启动tcpip 的deamon
/etc/rc.d System V 风格系统服务启动文件
/etc/rc.* 用来启动和停止系统服务的