[root@hexingxing /]# name=cc
[root@hexingxing /]# echo $name
cc// $：输出变量值，调用变量 name 值，用 $name 的方式获得变量的值
[root@hexingxing /]# cat /etc/selinux/config
# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
# enforcing - SELinux security policy is enforced.
# permissive - SELinux prints warnings instead of enforcing.
# disabled - No SELinux policy is loaded.
#SELINUX=enforcing
# SELINUXTYPE= can take one of these two values:
# targeted - Targeted processes are protected,
# mls - Multi Level Security protection.
#SELINUXTYPE=targeted
SELINUX=disabled// #：shell 脚本中，#开头的代表注释
[root@hexingxing /]# echo $(date)
2016 年 09 月 22 日 星期四 20:16:20 CST// $(date)：$() 引用系统命令
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