Differences between the set, env, and export commands in Linux

Differences between the set, env, and export commands in Linux: The set command displays the current shell variables, including the current user variables; The env command displays the current user variables; the export command displays the shell variables currently exported as user variables. Each shell has its own unique variable (set). This is different from the user variable. The current user variable has nothing to do with what shell you are using, No matter what shell you are using, for example, HOME, SHELL, and other variables, but shell variables are different from shell variables, such as BASH_ARGC and BASH. These variables are only displayed by set and are unique to bash, when an export parameter is not added, it shows which variables are exported as user variables, because a shell variable can be changed to a user variable through export "export.