查看Apache是否被安装：

[root@asg11 ~]#find / -name 'httpd'
/etc/sysconfig/httpd
/etc/httpd
/etc/logrotate.d/httpd
/etc/rc.d/init.d/httpd
/var/run/httpd
/var/log/httpd
/var/lock/subsys/httpd
/usr/sbin/httpd
/usr/lib64/httpd

由此确定Apache被安装的地方是/etc/httpd

查看Apache版本

首先进入httpd所在目录
[root@asg11 ~]#cd /etc/httpd

进而查看版本
[root@asg11 httpd]#httpd -v
Server version: Apache/2.2.15 (Unix)
Server built: Aug 13 2013 17:29:28

停止httpd
[root@asg11 httpd]#service httpd stop
Stopping httpd: [ OK ]

启动httpd
[root@asg11 httpd]#service httpd start
Starting httpd: [ OK ]

用浏览器访问试试：

[root@asg11 httpd]#

Apache的重要配置文件httpd.conf的位置在/etc/httpd/conf/httpd.conf

[root@asg11 conf]# pwd
/etc/httpd/conf
[root@asg11 conf]# ls
httpd.confmagic [root@asg11 conf]#