COBOL ソース コードから環境変数にアクセスするには、次の構文を使用します。
working-storage section.
01 val pic x(100).
Procedure division.
display "USERNAME" upon environment-name
accept val from environment-value
display val
goback.
...
重要: It is unsafe to modify or add environment variables in a threaded application on Linux systems. This is due to limitations
of the underlying system libraries. It is however safe to read values from environment variables.