Shell builtins are commands that are loaded into memory when a shell — such as bash, sh, or zsh — is invoked. The reason for this is that keeping these commands in memory helps ensure that these ...
I know this is hardly ideal, but I don't use X11 terms all that often, and I'm the only one on my laptop so I tend to just make X11 launch xterm as a login shell by editing /etc/X11/xinit/xinitrc so ...