About the use of #!/usr/bin/env python

In some Linux scripts, you need to specify the script's interpreter at the beginning of the line, such as:

!/usr/bin/env python

Again such as:

!/usr/bin/env Perl

So what's the use of env? When do you use this?
The reason why the script is started with Env is that the script interpreter may be installed in different directories in Linux, and Env can be found in the system's path directory. At the same time, Env also prescribes some system environment variables.

The env command is used to display environment variables that already exist in the system and to execute instructions in the defined environment

Reference:

1, http://www.jianshu.com/p/07a58fb1a92f

2, Http://man.linuxde.net/env

About the use of #!/usr/bin/env python