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I would use `getent passwd`, which is apparently expected by POSIX (but I don't know whether POSIX prescribes its output format).
Hm, you are right. I must have misread the manpage (I thought it claimed that it's a POSIX-mandated utility).
@robryk I don't believe there is a general getent utility in POSIX, just a getpwent system call, which the standard advises against using and recommends getpwuid instead.