※ 引述《Dennis1 (Dennis)》之銘言：
: ※ 引述《stevel (朝九晚五之睡覺族)》之銘言：
: : 嗯，想不到我沒用過 vacation 。
: : 正想要去 man 它的時候，卻發現我手上的 vacation 跟你的
: : 不太一樣，是要寫在 ~/.forward 裡的。當機器上的 sendmail
: : 收到信以後，會根據 .forward invoke vacation ，然後再
: : reply 給原發信人……如此這般。
: : 我開始懷疑，你用的 vacation 是不是別人寫好的 shell alias
: : 或是 function 或是 script 或是……？
: 應該不是吧....那只是一個Unix下的指令....應該啦.....
以下摘自 vacation 的 manual pages ，自己瞧瞧吧。
NAME
vacation - return ``I am not here'' indication
SYNOPSIS
vacation -i [-r interval]
vacation [-a alias] login
DESCRIPTION
Vacation returns a message to the sender of a message telling them that
you are currently not reading your mail. The intended use is in a
.forward file. For example, your .forward file might have:
\eric, "|/usr/bin/vacation -a allman eric"
which would send messages to you (assuming your login name was eric) and
reply to any messages for ``eric'' or ``allman''.
Available options:
-a alias
Handle messages for alias in the same manner as those received
for the user's login name.
-i Initialize the vacation database files. It should be used before
you modify your .forward file.
-r Set the reply interval to interval days. The default is one
week. An interval of ``0'' means that a reply is sent to each
message, and an interval of ``infinite'' (actually, any non-nu괊 meric character) will never send more than one reply. It should
be noted that intervals of ``0'' are quite dangerous, as it al괊 lows mailers to get into ``I am on vacation'' loops.
No message will be sent unless login (or an alias supplied using the -a
option) is part of either the ``To:'' or ``Cc:'' headers of the mail. No
messages from ``???-REQUEST'', ``Postmaster'', ``UUCP'', ``MAILER'', or
``MAILER-DAEMON'' will be replied to (where these strings are case insen괊 sitive) nor is a notification sent if a ``Precedence: bulk'' or
``Precedence: junk'' line is included in the mail headers. The people
who have sent you messages are maintained as an ndbm(3) database in the
file .vacation.db in your home directory.
Vacation expects a file .vacation.msg, in your home directory, containing
a message to be sent back to each sender. It should be an entire message
(including headers). For example, it might contain:
From: eric@CS.Berkeley.EDU (Eric Allman)
Subject: I am on vacation
Delivered-By-The-Graces-Of: The Vacation program
Precedence: bulk
I am on vacation until July 22. If you have something urgent,
please contact Keith Bostic <bostic@CS.Berkeley.EDU>.
--eric
Vacation reads the first line from the standard input for a UNIX ``From''
line to determine the sender. Sendmail(8) includes this ``From'' line
automatically.
Fatal errors, such as calling vacation with incorrect arguments, or with
non-existent logins, are logged in the system log file, using syslog(8).
FILES
~/.vacation.db database file
~/.vacation.msg message to send
SEE ALSO
sendmail(8), syslog(8)
HISTORY
The vacation command appeared in 4.3BSD.
4.3 Berkeley Distribution June 16, 1993 2
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