V3/usr/man/man1/mail.1

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.he 'MAIL (I)'10/25/72'MAIL (I)'
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NAME		mail  --  send mail to another user
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SYNOPSIS	mail____ [ -yn___ ]
.br
.ul
mail
letter person ...
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mail____ person
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DESCRIPTION	mail____
without an argument searches for a file called mailbox_______, prints
it if present, and asks if it should be saved.  If the answer
is "y", the mail is renamed mbox____, otherwise it is deleted.
Mail____ with a -yn___ argument works the same way, except
that the answer to the question is supplied by the argument.
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When followed by the names of a letter
and one or more people,
the letter is appended to
each person's mailbox_______.
When a person______ is specified without a letter______,
the letter is taken from the sender's standard input up to an EOT.
Each letter is preceded by the sender's name and a postmark.

A person______ is either
a user name recognized by login_____, in which case the mail
is sent to the default working directory of that user,
or the path name of a directory,
in which case mailbox_______ in that directory is used.
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When a user logs in he is informed of the presence
of mail.
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FILES		/etc/passwd	to identify sender
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		to locate persons
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mailbox		input mail
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mbox		saved mail
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SEE ALSO	login(I)
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DIAGNOSTICS	"Who are you?"
if the user cannot be identified for some reason (a bug).
"Cannot send to user" if mailbox_______ cannot be opened.
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BUGS		--