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In files case, super-users (for instance, real and effective
uid equal to zero, see id(1M) and su(1M)) may change any
password; hence, passwd does not prompt privileged users for
the old password. Privileged users are not forced to comply
with password aging and password construction requirements.
A privileged user can create a null password by entering a
carriage return in response to the prompt for a new pass-
word. (This differs from passwd -d because the "password"
prompt will still be displayed.)
The root user is permitted to change the password for any user. When root changes a user's password, the passwd command does not prompt for the old password. This permits root to "reset" a user's password in circumstances when the user has forgotten his or her password. This also permits root to lock a user's account by changing the user's password to a value that the user is unlikely to guess.
Well, I can kinda understand...they are posted to different forums (solaris, hp-ux, aix)...people might ignore one and comment on another based on their knowledge/experience...covering bases...if he posted to a single, more general forum, poweruses with the respective OSs might bypass it altogether. Very similar, true, but wasn't a "bad faith" of multi-posting, I don't think (reasonable explanation exists).
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