Import macOS userland

adv_cmds-176
basic_cmds-55
bootstrap_cmds-116.100.1
developer_cmds-66
diskdev_cmds-667.40.1
doc_cmds-53.60.1
file_cmds-321.40.3
mail_cmds-35
misc_cmds-34
network_cmds-606.40.1
patch_cmds-17
remote_cmds-63
shell_cmds-216.60.1
system_cmds-880.60.2
text_cmds-106

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+.\" Copyright (c) 1980, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"	@(#)mail1.nr	8.1 (Berkeley) 6/8/93
+.\"
+.sh 1 Introduction
+.pp
+.i Mail
+provides a simple and friendly environment for sending and receiving mail.
+It divides incoming mail into
+its constituent messages and allows the user to deal with them
+in any order.  In addition, it provides a set of
+.i ed -\c
+like commands for manipulating messages and sending mail.
+.i Mail
+offers the user simple editing capabilities to ease the composition
+of outgoing messages, as well as providing the ability to define and send
+to names which address groups of users.  Finally,
+.i Mail
+is able to send and receive messages across such networks as the
+ARPANET, UUCP, and Berkeley network.
+.pp
+This document describes how to use the
+.i Mail
+program to send and receive messages.  The reader is not assumed to
+be familiar with other message handling systems, but should be
+familiar with the \s-2UNIX\s0\**
+.(f
+\** \s-1UNIX\s0 is a trademark of Bell Laboratories.
+.)f
+shell, the text editor, and some of the common \s-2UNIX\s0 commands.
+.q "The \s-2UNIX\s0 Programmer's Manual,"
+.q "An Introduction to Csh,"
+and
+.q "Text Editing with Ex and Vi"
+can be consulted for more information on these topics.
+.pp
+Here is how messages are handled:
+the mail system accepts incoming
+.i messages
+for you from other people
+and collects them in a file, called your
+.i "system mailbox" .
+When you login, the system notifies you if there are any messages
+waiting in your system mailbox.  If you are a
+.i csh
+user, you will be notified when new mail arrives if you inform
+the shell of the location of your mailbox.  On version 7 systems,
+your system mailbox is located in the directory /var/mail
+in a file with your login name.  If your login name is
+.q sam,
+then you can make
+.i csh
+notify you of new mail by including the following line in your .cshrc
+file:
+.(l
+set mail=/var/mail/sam
+.)l
+When you read your mail using
+.i Mail ,
+it reads your system mailbox and separates that file into the
+individual messages that have been sent to you.  You can then
+read, reply to, delete, or save these messages.
+Each message is marked with its author and the date they sent it.