https://man7.org/linux/man-pages/man1/unshare.1.html

The unshare command creates new namespaces (as specified by the command-line options described below) and then executes the specified program. If program is not given, then “${SHELL}” is run (default: /bin/sh).

https://www.youtube.com/watch?app=desktop&v=8fi7uSYlOdc&feature=youtu.be