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±íÍ·Îļþ #include<stdlib.h>
¶¨Ò庯Êý char * getenv(const char *name);
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·¶Àý #include<stdlib.h>
mian()
{
char *p;
if((p = getenv(“USER”)))
printf(“USER=%s\n”,p);
}
Ö´ÐÐ USER = root
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±íÍ·Îļþ #include4<stdlib.h>
¶¨Ò庯Êý int putenv(const char * string);
º¯Êý˵Ã÷ putenv()ÓÃÀ´¸Ä±ä»òÔö¼Ó»·¾³±äÁ¿µÄÄÚÈÝ¡£²ÎÊýstringµÄ¸ñʽΪname£½value£¬Èç¹û¸Ã»·¾³±äÁ¿ÔÏÈ´æÔÚ£¬Ôò±äÁ¿ÄÚÈÝ»áÒÀ²ÎÊýstring¸Ä±ä£¬·ñÔò´Ë²ÎÊýÄÚÈÝ»á³ÉΪÐµĻ·¾³±äÁ¿¡£
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·¶Àý #include<stdlib.h>
main()
{
char *p;
if((p = getenv(“USER”)))
printf(“USER =%s\n”,p);
putenv(“USER=test”);
printf(“USER+5s\n”,getenv(“USER”));
}
Ö´ÐÐ USER=root
USER=root
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±íÍ·Îļþ #include<stdlib.h>
¶¨Ò庯Êý int setenv(const char *name,const char * value,int overwrite);
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