Difference set under linux, export, env of

The difference between the set and export

set can be used to display the values ​​of all variables, and can export a variable export, can also be found in its child shell or sub-process

The difference between export and env

The role of both is the same, except that env is an external tool

Basic Usage

Simply use the set, you can see all the current shell variables are defined, including local and export; unset can be used to delete a variable
use of export (env) can see all the variables exported (ie environment variable); use of export VARIABLE define an environment variable, or export to a local variable environment variable.

ref

What's the difference of the command output after inputting the command “env”, “export”, “set” under Bash Shell in Solaris?