GETENV(3)

NAME
2.18 `getenv'--look up environment variable

SYNOPSIS
     #include <stdlib.h>
     char *getenv(const char *NAME);

DESCRIPTION
`getenv' searches the list of environment variable names and values (using the global pointer "`char **environ'") for a variable whose name matches the string at NAME. If a variable name matches, `getenv' returns a pointer to the associated value.

RETURNS
A pointer to the (string) value of the environment variable, or `NULL' if there is no such environment variable.

PORTABILITY
`getenv' is ANSI, but the rules for properly forming names of environment variables vary from one system to another.
   `getenv' requires a global pointer `environ'.

SEE ALSO
getenv is part of the library. The full documentation for is maintained as a Texinfo manual. If info and are properly installed at your site, the command

    info

will give you access to the complete manual.