1、本地可以运行system命令，可是通过cgi调用时却不执行，没有执行cgi中重定向命令。初始分析出是权限问题。
2、解决方法：
1）给cgi加权限
chmod +s my.cgi
2）配置apache以使其可执行cgi
<IfModule !mpm_netware_module>
<IfModule !mpm_winnt_module>
# If you wish httpd to run as a different user or group, you must run
# httpd as root initially and it will switch.
# User/Group: The name (or #number) of the user/group to run httpd as.
# It is usually good practice to create a dedicated user and group for
# running httpd, as with most system services.
User daemon
Group daemon
</IfModule>
</IfModule>
重启apache
/usr/local/apache2/apachectl -k restart
3）给所在的目录加权限
参考
【1】 关于权限，有比较好的引用
http://www.cnblogs.com/mydomain/archive/2011/09/28/2194048.html