They do: - PowerShell has Ctrl+Z - Bash has Ctrl+/ - Fish has Ctrl+Z and Ctrl+/ both not sure about others, surely if you're using busybox ash this won't wo

They do: - PowerShell has Ctrl+Z - Bash has Ctrl+/ - Fish has Ctrl+Z and Ctrl+/ both not sure about others, surely if you're using busybox ash this won't work (no line editing will work), but I'm sure most shells have some sort of undo, as long as they have any line editing at all.