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在linux中，我们很多时候需要查看文件的配置内容，但是这样会总会看到很多含有注释的内容：
[root@localhost ~]# 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 three two values:
# targeted - Targeted processes are protected,
# minimum - Modification of targeted policy. Only selected processes are protected.
# mls - Multi Level Security protection.
SELINUXTYPE=targeted
那么，我们可以使用egrep命令：
[root@localhost ~]# egrep ^# /etc/selinux/config
^#：选择所有以#开始的[root@localhost ~]# egrep ^# /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.
# SELINUXTYPE= can take one of three two values:
# targeted - Targeted processes are protected,
# minimum - Modification of targeted policy. Only selected processes are protected.
# mls - Multi Level Security protection.
使用反选：-v
[root@localhost ~]# egrep -v ^# /etc/selinux/config
SELINUX=enforcing
SELINUXTYPE=targeted
[root@localhost ~]#
当然，这里面有空格行，linux下的空格行是以$开始的，所以我们需要使用^$符号来选择空格行，并且反选
[root@localhost ~]# egrep -v '^$|^#' /etc/selinux/config
SELINUX=enforcing
SELINUXTYPE=targeted
[root@localhost ~]#
注意：^$|^#中间的"|"符号是或者的意思