putenv example in C
Use : To change the environmental variable value Syntax: int putenv(char *string) Arguments : Takes a string as NAME=VALUE, where NAME is the name of the environmental variable and VALUE is the value of the environmental variable you want to set If NAME is present in the environment list then replace the value else it will add this to the environmental list Return Type: 0 on success -1 if any error Code: #include<stdio.h> #include<stdlib.h> int main() { int result=putenv("NAME=TEST"); if(result==0) { printf("\n environmental variable successfully written"); printf("\n value of the environmental variable written is %s",getenv("NAME")); }else{ printf("\n error in writing the environmental variable"); } return 0; }