usr/man/man3/getenv.3

.TH GETENV 3
.SH NAME
getenv \- value for environment name
.SH SYNOPSIS
.nf
.B char *getenv(name)
.B char *name;
.fi
.SH DESCRIPTION
.I Getenv
.a
searches the environment list
(see
.IR environ (5))
for a string of the form
.IB name = value
and returns
.I value
if such a string is present, otherwise 0 (NULL).
.SH SEE ALSO
environ(5), exec(2)