file­con­tents – Ex­tended file­con­tents and file­con­tents* en­vi­ron­ments

LaTeX2ε's file­con­tents and file­con­tents* en­vi­ron­ments en­able a LaTeX source file to gen­er­ate ex­ter­nal files as it runs through LaTeX. How­ever, there are two lim­i­ta­tions of these en­vi­ron­ments: they refuse to over­write ex­ist­ing files, and they can only be used in the pream­ble of a doc­u­ment. The file­con­tents pack­age re­moves these lim­i­ta­tions, let­ting you over­write ex­ist­ing files and let­ting you use file­con­tents/file­con­tents* any­where.