Linux and UNIX Man Pages

Linux & Unix Commands - Search Man Pages

getenv(3) [osf1 man page]

getenv(3)						     Library Functions Manual							 getenv(3)

getenv - Returns the value of an environment variable LIBRARY
Standard C Library (, libc.a) SYNOPSIS
#include <stdlib.h> char *getenv( const char *name); STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: getenv(): XPG4, XPG4-UNIX Refer to the standards(5) reference page for more information about industry standards and associated tags. PARAMETERS
Specifies the name of an environment variable. DESCRIPTION
The getenv() function searches the environment list for a string of the form name=value, and returns a pointer to a string containing the corresponding value for name. The returned string should not be modified by the application, but may be overwritten by a subsequent call to the getenv() or putenv() functions from the same thread. RETURN VALUES
The getenv() function returns a pointer to a string containing the value in the current environment if such a string is present. If such a string is not present, a null pointer is returned. RELATED INFORMATION
Functions: putenv(3), clearenv(3) Commands: sh(1) Standards: standards(5) delim off getenv(3)

Check Out this Related Man Page

GETENV(3)						     Linux Programmer's Manual							 GETENV(3)

getenv - get an environment variable SYNOPSIS
#include <stdlib.h> char *getenv(const char *name); DESCRIPTION
The getenv() function searches the environment list to find the environment variable name, and returns a pointer to the corresponding value string. RETURN VALUE
The getenv() function returns a pointer to the value in the environment, or NULL if there is no match. CONFORMING TO
SVr4, POSIX.1-2001, 4.3BSD, C89, C99. NOTES
The strings in the environment list are of the form name=value. As typically implemented, getenv() returns a pointer to a string within the environment list. The caller must take care not to modify this string, since that would change the environment of the process. The implementation of getenv() is not required to be reentrant. The string pointed to by the return value of getenv() may be statically allocated, and can be modified by a subsequent call to getenv(), putenv(3), setenv(3), or unsetenv(3). SEE ALSO
clearenv(3), putenv(3), setenv(3), unsetenv(3), environ(7) COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at GNU
2008-03-17 GETENV(3)

4 More Discussions You Might Find Interesting

1. Programming


Below is an extract from man page of getenv(3c) NOTES 1> getenv() can be safely called from a multi-thread program. 2> However, care must still be taken when using getenv() and putenv(3C) in a multi-thread program. 3> These routines examine and modify the environment list. 4> This list is... (1 Reply)
Discussion started by: deaniyoer
1 Replies

2. Programming

environment variables

Hi! How-to get the environment variables in GNU. getenv() only fetches the ones that you can find under export (not the ones under declare)... best regars .David (2 Replies)
Discussion started by: Esaia
2 Replies

3. Shell Programming and Scripting

Perl Scripting

There is a function in Perl named PerlEnv_getenv() which is equivalent to getenv() in C. It invokes the environment variable. It uses the library the library perlclib.How to define this library and use the Perl function? (3 Replies)
Discussion started by: agarwal
3 Replies

4. Programming

Cast from String to char

Hello, This is my code: i'd like to like to add getenv("MYLIB") in the first case of my buffer inside of '1' , should i do the cast ? and how please ? Thank you. (1 Reply)
Discussion started by: chercheur857
1 Replies

Featured Tech Videos