

A lot of non-graphical utilities — basically the *NIX coreutils, plus stuff like rsync, ssh, compression/archival tools (tar, gzip, bzip2, etc.), grep, and the like. Git also comes to mind.
I think part of this is that the UNIX philosophy is “developer friendly” — tell a good dev they need to make a compression utility that follows this protocol, and they will make a compression utility that follows the protocol.
If your baby isn’t super fussy, the transportation difficulty (in our experience) is more in the logistics getting to/from airport, and dealing with other ground transportation. We just flew 5+hrs (coast to coast, US) with a 2mo and a ~3yo, and it was a piece of cake (typing that, I’ve jinxed the return flight…).
We haven’t done international travel with our kids yet, but we will eventually. When I was 2 my family went to Europe — some countries were meh with respect to kids, but Italy (from my folks’ retelling) was fantastic, as there is (or was) a big cultural love for young kids.
YMMV of course, but it’s absolutely doable! Kids — even starting as babies — have personalities, and you’ll get a sense of what’s appropriate with yours. Good luck!