已解決

[octopus@pc5 mobile_devices]$ make
gcc -c main.c
gcc main.o -o main
[octopus@pc5 mobile_devices]$ rm check
[octopus@pc5 mobile_devices]$ mv main check
[octopus@pc5 mobile_devices]$ ./check
There are 147 items.
Please provide your HTTP_USER_AGENT string: (D = Default)
HTTP_USER_AGENT: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Tablet PC 2.0; BOIE9;ZHCN)
No keyword!
[octopus@pc5 mobile_devices]$