V3/man/man1/passwd.1

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NAME		passwd -- set login password
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SYNOPSIS	passwd______ name password
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DESCRIPTION	The
password is placed on the given login name.
This can only be done by the user ID
corresponding to the login name or by the super-user.
An explicit null argument ("") for the password
argument will remove
any password from the login name.
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FILES		/etc/passwd
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SEE ALSO	login(I), passwd(V), crypt(III)
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DIAGNOSTICS	Diagnostics
are given for a non-match of the login name,
lack of permission and for password file format errors.
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BUGS		--