get_env/2—retrieve the value of an environment  variable

The get_env/2 function retrieves the value of an environment  variable. The syntax for this function is as follows:

get_env($ENVVAR,$VALUE)
$VALUE=get_env($ENVVAR)

get_env/2 arguments

Argument

Mode

Type

Description

$ENVVAR

Input

STRING

Specifies the environment variable name for which the value is to be retrieved

$VALUE

Output

STRING

Value of the environment variable

Use the get_env/2 to obtain the value of environment variable $ENVVAR and return the value in $VALUE.

If the specified variable is not defined in the environment, an empty string is returned.

get_env/2 example

$HOME = get_env(HOME);

 

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