Much like more, it can successfully work in truly messed-up environments. It needs no cursor-control at all to do its basic job.<br><br>It's obnoxious to use interactively, true, but can be tiny and easily pays for itself the first time you have to work blind to modify a file.<br>
<br>It's also more useful than sed for modifying files from scripts. More than once, I have used it to let a shell script change a config option in a config file in cases where sed was inappropriate or missing/broken. If you're a little careful, you can use it to change just the option you care about without even damaging the surrounding comments. And unlike sed, it already takes care of the write-out phase without you having to explicitly sed to a tempfile, rename, handle possible error cases.<br>
<br>If it's not available, it is possible to work around it, but it does really simplify a lot of things that are likely to be needed in minimal environments.<br><br><br><br>