You can set it as your login shell, but keep /bin/sh as bash or dash. The `chsh' command is what you want to use, but in my experience editing /etc/passwd manually is more reliable. GUI terminal emulators may require additional configuration.>>309
Just check a list of all your installed packages, and delete the ones you don't want. If you use gentoo you can edit your /var/lib/portage/world to remove old crap you don't need, and then run emerge –depclean.>>799
Alpine has a similar simplicity to it. I've just switched to it from Gentoo, because I was a retard and I deleted some important libraries. I was unable to fix the problem manually within a reasonable timeframe and I didn't feel like compiling everything from scratch, so I backed up /home and switched to Alpine.