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#include <unistd.h>
#include <stdio.h>
int main()
{
        const char* file1 = "access.cpp";
        const char* file2 = "access1.cpp";
        printf("%s:%d\n", file1, access(file1, F_OK));
        printf("%s:%d\n", file2, access(file2, F_OK));
        return 0;
}
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access.cpp:0
access1.cpp:-1


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      ÎÒ×Ô¼ºÔÚPCÉÏдÁËÒ»¸öС³ÌÐò½øÐÐÑéÖ¤£¬·¢ÏÖ¹ûÈ»ÊÇÕâÑù¡£Èç¹û°ÑÈ«²¿.oÎļþ£¨ÓÃ-ggdb3Ñ¡Ïî±àÒ룬´øµ÷ÊÔÐÅÏ¢£©Ö±½Ó±àÒë³É¿É ......

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linuxϵÄÖ÷ÒªÎļþ
/boot/grub/grub.conf    GRUB configuration file
/boot/module-info-*    Module information for the Linux kernel
/boot/System.map-*    Map of the Linux kernel
/boot/vmlinuz-*    Linux kernel
/etc/aliases    Mail aliases
/etc/a ......

ÔÚLinuxϲ鿴¶Ë¿ÚµÄʹÓÃÇé¿ö¼°Æô¶¯

Netstat -tln ÃüÁîÊÇÓÃÀ´²é¿´linuxµÄ¶Ë¿ÚʹÓÃÇé¿ö
/etc/init.d/vsftp start ÊÇÓÃÀ´Æô¶¯ftp¶Ë¿Ú~£¡
¿´Îļþ/etc/services
netstat
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netstat -a
²é¿´ËùÓеķþÎñ¶Ë¿Ú£¨LISTEN£¬ESTABLISHED£©
sudo netstat -ap
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nmap £¼É¨ÃèÀàÐÍ£¾£¼É¨Ã ......

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LinuxÖÐʹÓÃÃüÁîÐÐʱ£¬ÓÐʱÐèÒª²éÕÒËùÐèÒªµÄÎļþ¡£ShellÌṩÁËÒ»Ì××Ö·û´®Ä£Ê½Æ¥Å乿Ôò£¬»ò³ÆÖ®ÎªÔª×Ö·û´®¡£¿ÉÒÔ°´ÕÕËùÒªÇóµÄģʽÀ´Æ¥ÅäÎļþ£¬»¹¿ÉÒÔʹÓÃ×Ö·ûÀàÐÍÀ´Æ¥ÅäÎļþÃû¡£ÔÚ´ËÖ÷Òª½éÉܼ¸ÖÖ³£¼ûµÄÌØÊâ×Ö·û£º
1¡¢*  Æ¥ÅäÎļþÃûÖеÄÈκÎ×Ö·û´®£¬°üÀ¨¿Õ×Ö·û´®£»
2¡¢£¿ Æ¥ÅäÎļþÃûÖеÄÈκε¥×Ö·û´®
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linuxÏÂapache+php°²×°³£¼ûÎÊÌâ
configure: error: Unable to find libgd.(a|so)
Èç¹ûʹÓõÄÊÇubuntu»òdebian¾ÍºÜ¼òµ¥ÁË£¬Ö±½Ósudo apt-get install apache2 libapache2-mod-php5 php5 php5-gd ¾Í»ù±¾Éϸ㶨£¬µ«ÊÇÓÃÔ´´úÂë°²×°»¹ÊǺÜÂé·³¡«
wget http://www.boutell.com/gd/http/gd-2.0.11.tar.gz
tar zxvf gd-2.0.11 ......
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