[MrGilbert]

> [...] the person who chose to use the phrase "Linux commands" doesn't really know what they're doing.

I'm quite certain they know pretty well what they are doing. To catch people's attention, you need to use "their" language. People will search for "linux command" more often than for "posix command". And it's totally fine to use that in the description, just to make it more precise in the Readme.