[twic]

The other useful thing is filtering - on sufficiently modern versions of less [1], you can use & to filter the lines, in the same way you use / to search them - only lines matching the filter are shown, and the display continues to update. Use &! for a negative filter. This has replaced grep | tail for me, with the advantage that it's non-destructive, so you can undo the filter, reapply a different one, etc.

[1] Everything i've used on Linux in the last few years, not the vanilla one on the Mac, but the one in Homebrew

[barrkel]

& is very handy, however it is also excruciatingly slow. It looks like it uses an O(n^2) algorithm, just from observing how slow it works.