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/etc/passwdwhen they're making batch changes, like changing the GECOS field for all users due to moving/restructuring (global room or phone number changes, etc.) It's not common anymore, but there are specific reasons that crop up from time to time.useraddand other tools may do things you may not want, like generate a user group or populate home directories (unless you know the options to suppress that) and this may not be desired in some cases.vicertainly gives more direct control.