change or add an environment variable NAME putenv - change or add an environment variable LIBRARY Standard C library ( libc , -lc ) SYNOPSI......ble environ to NULL. After this call, new variables can be added to the environment using putenv (3) and setenv (3). RETURN VALUE The clearenv () function returns zero on succes…...This function makes copies of the strings pointed to by name and value (by contrast with putenv (3)). The unsetenv () function deletes the variable name from the environment. If…...This function makes copies of the strings pointed to by name and value (by contrast with putenv (3)). The unsetenv () function deletes the variable name from the environment. If…...nv () may be statically allocated, and can be modified by a subsequent call to getenv (), putenv (3), setenv (3), or unsetenv (3). The "secure execution" mode of secure_getenv (…...nv () may be statically allocated, and can be modified by a subsequent call to getenv (), putenv (3), setenv (3), or unsetenv (3). The "secure execution" mode of secure_getenv (…...r an execve (2), the process modifies its environment (e.g., by calling functions such as putenv (3) or modifying the environ (7) variable directly), this file will not reflect …...f an exec (3). A C program can manipulate its environment using the functions getenv (3), putenv (3), setenv (3), and unsetenv (3). What follows is a list of environment variabl…...sake of example, limiting the screen-size to 10x20): #include <curses.h> int main(void) { putenv("LINES=10"); putenv("COLUMNS=20"); initscr(); start_color(); init_pair(1, COLOR_…...e() lrand48() mrand48() nftw() nl_langinfo() ptsname() putc_unlocked() putchar_unlocked() putenv() pututxline() rand() readdir() setenv() setgrent() setkey() setpwent() setutxen…