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+ENVIRON(3lua) "3lua" "Callisto manual pages"
+
+# NAME
+*environ* - the process environment
+
+# DESCRIPTION
+The *environ* table contains a metatable allowing
+indexes to get or set variables in the environment.
+Variables and variable values are provided as strings.
+
+The metatable's _\_\_index_ field returns
+the value of the given variable.
+This means any index into the *environ* table will yield the value of
+the corresponding variable in the environment.
+
+The metatable's _\_\_newindex_ field sets the given variable's value.
+This means you can set any key in the *environ* table to set
+the value of an environment variable.
+
+The metatable's _\_\_pairs_ field returns an iterator function
+allowing iteration over all variables in the environment using
+the *pairs* library function.
+
+# EXAMPLES
+Get the value of the _HOME_ environment variable and use it to
+set the _HOMEDIR_ environment variable:
+
+	local home = environ["HOME"]
+	environ["HOMEDIR"] = fs.dirname(home)
+
+Print the values of every variable in the environment:
+
+	for var in pairs(environ) do
+		print(var .. " = " environ[var])
+	end
+
+# SEE ALSO
+callisto(3lua), process(3lua)