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lang-bash
$REPLYis a builtin variable from the shell not environment. for your question trydeclare -xsetcommand might do what you want.setanddeclare -xseem to be working for me. Thank Youprintenvwill show all the environment variables that are set in your current shell. It doesn't show all that could be set (you can technically set almost any string as an environment variable). There are a large number that will be set under certain circumstances (e.g. in an ssh session); or that, if set, would have a special function (e.g. theLANGandLC_*variables, which would tell programs what locale to use; seeman locale). There are no full lists of those, because anyone who writes a program can make it create/react to any variable they want, thus creating a new one.