Ausam/doc/man/man1/passwd.1

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including files from this version of Unix. 
.th PASSWD I 11/4/78
.sh NAME
passwd \*- change login password
.sh SYNOPSIS
.bd passwd
[ -v ] [ name ]
.sh DESCRIPTION
The
.it new-password
becomes associated with the given login name.
This can only be done by corresponding user
or by the super-user.
If
.it name
is not given,
the passwords requested will apply to the present real uid.
.s3
The
.it old-password
will be requested (without echo) from standard input.
Then the
.it new-password
will be requested twice (without echo) from standard input;
once to enter it and secondly to check that the
.it new-passwd
had been correctly typed.
The -v option disables this checking.
An immediate reply of carriage return will denote the null password.
.sh FILES
/etc/passwd
.sh "SEE ALSO"
passwd (V), crypt (III), getty(VIII).
.sh BUGS