How to scroll the terminal emulator window in smaller steps using the keyboard?
Gnome terminal (and others) uses ctrl+shift+up and ctrl+shift+down to scroll one row.
But ctrl+shift should work in most other terminal emulators (like xterm or urxvt if not intercepted by windows managers or stuff.
If using iTerm2, you can see all shortcuts in Preferences Panel.
⌘ ↑ Move one line up in scrollback buffer
⌘ ↓ Move one line down in scrollback buffer
You can also add your own shortcuts. I regularly use these 2 for example:
⇪ ⌘ ↑ Move one page up in scrollback buffer
⇪ ⌘ ↓ Move one page down in scrollback buffer
And that's how it looks like:
