Your aliases are generally sourced from your shell rc file (ie ~/.bashrc). Not sure how vim launches the shell to run ex shell commands but in the interest of p

Your aliases are generally sourced from your shell rc file (ie ~/.bashrc). Not sure how vim launches the shell to run ex shell commands but in the interest of portability it's probably just sh with no rc files loaded. This is probably configurable. Try :help shell or :help :! (I'm not at a terminal so not sure what you'll find)