Most likely $PATH and variables like eg. $JAVA_HOME get modified so that asdf captures any invocation to commands like "python" in the shell, and runs its own c

Most likely $PATH and variables like eg. $JAVA_HOME get modified so that asdf captures any invocation to commands like "python" in the shell, and runs its own code instead of /usr/bin/python. Then it can decide which version of Python to defer to. Edit: here it is: https://github.com/asdf-vm/asdf/blob/v0.10.2/asdf.sh#L30-L31 https://github.com/asdf-vm/asdf/blob/v0.10.2/asdf.sh#L30-L31