getenv.3

操作系统设计与实现源码

.\"	@(#)getenv.3	6.1 (Berkeley) 5/15/85
.\"
.TH GETENV 3 "May 15, 1985"
.AT 3
.SH NAME
getenv \- value for environment name
.SH SYNOPSIS
.nf
.ft B
#include <stdlib.h>

char *getenv(const char *\fIname\fP)
.ft R
.fi
.SH DESCRIPTION
.B Getenv
.a
searches the environment list
(see
.BR environ (7))
for a string of the form
.IB name = value
and returns a pointer to the string
.I value
if such a string is present, otherwise 
.B getenv
returns the null pointer.
.SH SEE ALSO
.BR environ (7),
.BR execve (2).