What is the maximum username length, and is there way to extend it?
No. Username length It’s not configurable. Under libc-5, the utmp and wtmp files only allow 8 characters for a username. Under libc-6, this is increased to 32 characters. You can use usernames longer than this limit. However, the utmp/wtmp entries will be truncated, and so won’t correspond to a valid username. This doesn’t matter for most things.
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