Scroll half page up / down
copy mode
// what it does
In vi copy mode, Ctrl+u runs `halfpage-up` and Ctrl+d runs `halfpage-down`, scrolling the view by half a screen each press. Half-page jumps keep a few overlapping lines visible, which makes it easier to read continuously than full-page paging.
// shortcut
Ctrl + u
Ctrl + d
// gotcha
These are copy-mode-vi bindings, distinct from the shell where Ctrl+u kills the input line and Ctrl+d sends EOF — same keys, completely different effect depending on whether you're in copy mode.