What are common pitfalls with env command?

The env command in Linux is a powerful utility that allows users to run a program in a modified environment. However, there are some common pitfalls that users should be aware of to avoid unexpected results:

• Not Understanding Variable Scope: The environment variables set using env are only available in the command it executes. Once that command completes, the changes are lost.
• Overwriting Important Environment Variables: If you're not careful, you can unintentionally overwrite existing environment variables that are crucial for system operations.
• Using Incorrect Syntax: The syntax for env can be tricky, and small errors can lead to commands not executing as intended.
• Not Testing Environment Changes: Changes to the environment can affect the performance of scripts or programs. It's important to test changes before relying on them.

Consider this example of using env to run a Python script with a specific environment variable:

This command sets MY_VAR to "Hello" for the execution of my_script.py. Due to previous pitfalls, ensure that MY_VAR isn't crucial for other processes.