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slocal(1mh) [ultrix man page]

slocal(1mh)															       slocal(1mh)

       slocal - MH receive-mail hooks

       slocal $HOME/.maildelivery [ -form formfile ] [ switches for ] address ...  [ -help ]

       /usr/lib/mh/rcvpack file [ -help ]

       /usr/lib/mh/rcvtty [ command ...  ] [ -help ]

       A  receive-mail	hook  is a program that is run whenever you receive a mail message.  You do not invoke the hook yourself; it is invoked on
       your behalf by when you include the following line in your file in your home directory:
       | /usr/lib/mh/slocal -user $USER

       The file, which is an ordinary ASCII file, controls how local delivery is performed.  This file is read by

       The format of each line in the file is:
       field pattern action result string

       These components are explained below:

       field:	 The name of a field that is to be searched for a pattern.  This is any field in the headers of the message that might be present.
		 In addition, the following special fields are also defined:

		 source: the out-of-band sender information

		 addr: the address that was used to cause delivery to the recipient

		 default: this matches only if the message has not been delivered yet

		 *: this always matches

       pattern:  The sequence of characters to match in the specified field.  Matching is case-insensitive but not Regular Expression-based.

       action:	 The action to take to deliver the message.  This is one of the following:

		 file or >:

		 Append  the  message to the file named by string using the standard maildrop delivery process.  If the message can be appended to
		 the file, then this action succeeds.  When writing to the file, a new field is added:
		 Delivery-Date: <date>
		 This field indicates the date and time at which the message was appended to the file.

		 pipe or | :

		 Pipe the message as the standard input to the command named by string.  The Bourne shell, is used to interpret the string.  Prior
		 to giving the string to the shell, it is expanded with the following built-in variables:

		 $(sender): the return address for the message

		 $(address): the address that was used to cause delivery to the recipient

		 $(size): the size of the message in bytes

		 $(reply-to): either the Reply-To: or From: field of the message

		 $(info): miscellaneous out-of-band information

		 When  a process is invoked, its environment is as follows: the user/group id's are set to recipient's id's; the working directory
		 is the recipient's directory; the umask is 0077; the process has no the standard input is set to the message; the standard output
		 and  diagnostic  output  are set to all other file-descriptors are closed; the environment variables $USER, $HOME, and $SHELL are
		 set appropriately; no other environment variables exist.

		 The process is given a certain amount of time to execute.  If the process does not exit within this limit, it is terminated.  The
		 amount of time is calculated as ((size x 60) + 300) seconds, where size is the number of bytes in the message.

		 The  exit  status  of the process is consulted to determine the success of the action.  An exit status of 0 means that the action
		 succeeded.  Any other exit status (or abnormal termination) means that the action failed.

		 In order to avoid any time limitations, you might implement a process that began by forking.  The parent would return the  appro-
		 priate  value	immediately, and the child could continue to do whatever it wanted for as long as it wanted.  This approach should
		 only be used if you do not care about the outcome of the action, because the success or failure of the child  process	cannot	be
		 passed  back to However, if the parent is going to return a non-zero exit status, then this approach can lead to quicker delivery
		 into your maildrop.

		 qpipe or ^ :

		 This is similar to pipe, but executes the command directly, after built-in variable expansion, without assistance from the shell.


		 This action always succeeds.

       result:	 Indicates how the action should be performed.	The following values are valid:


		 Perform the action.  If the action succeeded, then the message is considered delivered.


		 Perform the action.  Regardless of the outcome of the action, the message is not considered delivered.


		 Perform the action only if the message has not been delivered.  If the action succeeded, then the message  is	considered  deliv-

       The file is always read completely, so that several matches can be made and several actions can be taken.  The file must be owned either by
       the user or by root, and must be writable only by the owner.  If the file cannot be found, or does not perform an action which delivers the
       message, then the file is read according to the same rules.  This file must be owned by the root and must be writable only by the root.	If
       this file cannot be found or does not perform an action which delivers the message, then standard delivery to the user's maildrop, is  per-

       Arguments in the file are separated by a comma (,) or by white space.  Since double quotes are honored, these characters may be included in
       a single argument by enclosing the entire argument in double quotes (").  A double quote can be included by preceding it with a back-slash.

       Four programs are currently available: redistributes incoming messages to additional recipients; saves incoming messages  in  a	file;  and
       notifies the user of incoming messages.	The fourth program, is described in the reference page.  They all reside in the directory.

       The program resends a copy of the message to all of the addresses listed on its command line.  It uses the format string facility described

       The program appends a copy of the message to the file listed on its command line.  It is made obsolete by

       The program executes the named file with the message as its standard input, and gives the resulting output to the  terminal  access  daemon
       for  display  on your terminal.	If the terminal access daemon is unavailable on your system, then writes the output to your terminal, only
       if your terminal has world-writable permission.	If no valid file is specified, then gives a one-line scan listing to the  terminal  access

       For  compatibility with older versions of MH, if cannot find the user's file, it attempts to execute an old-style hook in the user's direc-
       tory.  Specifically, it first attempts to execute the command:
       .mh_receive file maildrop directory user
       Failing that it attempts to execute:
       $HOME/bin/rcvmail user file sender
       If both of these fail, it gives up and write to the user's maildrop.

       In addition, whenever a hook or process is invoked, file-descriptor three(3) is set to the message in addition to the standard input.

       Only two return codes are meaningful, others should be.

       This section shows how could be used.

       In this example, line-by-line comments have been extracted from the code to aid readability of the example.  The  line  numbers	would  not
       normally be in the code; they are there to help you.  The code fragment precedes the explanation:

	     field     pattern	  action    result   string(1)   To        mmdf2	  file	    A	     mmdf2.log(2)   From      mmdf	  pipe	    A	     err-message-archive(3)   Sender    uk-mmdf	  file	    ?	     mmdf2.log(4)   To        Unix	  >	    A	     unix-news(5)   addr      jpo=mmdf   |	    A	     mmdf-redist(6)   addr      jpo=ack	  |	    R	     resend -r $(reply-to)
       (7)   From      steve	  destroy   A	     -
       (8)   default   -	  >	    ?	     mailbox(9)   *	       -	  |	    R	     rcvalert

       Line 1:	 File mail with mmdf2 in the To: line into file

       Line 2:	 Messages from mmdf are piped to the program

       Line 3:	 Take anything with the address uk-mmdf in the Sender: field, and file it in if it has not already been filed by line 1.

       Line 4:	 Put messages addressed to Unix in the file

       Line 5:	 If the address is jpo=mmdf, pipe the message into

       Line 6:	 If the address is jpo=ack, send an acknowledgement copy back.

       Line 7:	 Destroy anything from steve.

       Line 8:	 Take anything that is not matched yet and put it into mailbox.

       Line 9:	 Always run

       The system customization file.

       The system default file controlling local delivery.

       The user-supplied alternative to the system default file
		 controlling local delivery.

See Also

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