NAME

getenv, setenv, unsetenv − manipulate environmental variables

SYNOPSIS

char ∗getenv(name)
char ∗name;

void setenv(name, value)
char ∗name, ∗value;

void unsetenv(name)
char ∗name;

DESCRIPTION

Getenv searches the environment list (see environ(7)) for a string of the form name=value and returns a pointer to the string value if such a string is present, and 0 (NULL) if it is not. 

Setenv searches the environment list as getenv does; if the string name is not found, a string of the form name=value is added to the environment.  If it is found, its value is changed to value. 

Unsetenv removes all occurrences of the string name from the environment.  There is no library provision for completely removing the current environment.  It is suggested that the following code be used to do so. 

static char∗envinit[1];
extern char∗∗environ;
environ = envinit;

SEE ALSO

csh(1), sh(1), execve(2), environ(7)

Sprite version 1.0  —  March 20, 1987