Hello, Dax Kelson napsal(a): > Since, well forever, I've understood the UNIX and Linux username best > practices to be: I don't know about best practices, but FWIW these are the hard limits in shadow-utils and libuser: > (a) all lowercase > (b) alphanumeric with exception that first char must not be a number [a-zA-Z0-9.-_]*, first char must not be -. First char can be a number, in fact the user name can be completely numeric (which of course a stupid thing to do). > (c) 8 char max length UT_NAMESIZE - 1 (31) bytes. > The origin of (a) I believe comes from the fact that historically there > was a one-to-one mapping between email addresses and usernames and since > email addresses are not case sensitive, usernames that only differ by > case cause email ambiguities. One other possible reason is that traditional UNIX supported uppercase-only terminals (by mapping all characters to uppercase on output and to lowercase on input), and getty would switch to the uppercase-only mode when the username was entered in all uppercase. I have seen this behavior on Debian about five years ago. Mirek -- fedora-devel-list mailing list fedora-devel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-devel-list
