linux - mkdir system call with variable (C) -

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i'm new linux system programming. task is: create system variable "my_dir" valuable "lab01" , create file inside it.

i've created folder, can't create file using varialble

putenv("my_dir=lab01"); mkdir_ret_code = mkdir(("/home/alexander/%s",getenv("my_dir")),0777);

how solve problem?

use array , use these functions http://linux.die.net/man/3/string


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