Replying to
@atax1a@infosec.exchange @joe@f.duriansoftware.com @thalia@discuss.systems or at least that’s the source of the question, we might all be misreading the notation since both the first arguments are bracketed in the second case
computers dragon, trans lesbian, probably reading books or playing video games. she/they
@atax1a@infosec.exchange @joe@f.duriansoftware.com @thalia@discuss.systems no, look at the [fd,] in the first case indicating that the file descriptor is optional