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Full Discussion: Exec command - what is it doing here?
Top Forums Shell Programming and Scripting Exec command - what is it doing here? Post 302806433 by alister on Monday 13th of May 2013 04:56:24 AM
Old 05-13-2013
Quote:
Originally Posted by el_foz
If I wanted to cancel this behaviour later in the script, how would I do that?
Code:
exec 1>nul 2>nul

Depends what you mean by cancel.

If you simply want to discard output and error messages so that they cease to appear in the logs, you can redirect to /dev/null (although this will not affect any commands that are already logging and running).

If instead you would like to revert output and errors to their original destinations, you'll have to use exec to save the original locations.

The very last example at Advanced Bash-Scripting Guide: I/O Redirection demonstrates how to do this with standard output.

Regards,
Alister
 

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LEARN ABOUT DEBIAN

cancelmsg

CANCELMSG(1)						      Double Precision, Inc.						      CANCELMSG(1)

NAME

       cancelmsg - Cancel an E-mail message

SYNOPSIS

       cancelmsg {msgid} ["reason"]

DESCRIPTION

       cancelmsg removes a message from the mail queue. There will be no more attempts to deliver this message, and a standard delivery failure
       notice is sent to the return address listed on the message. You can only cancel your own messages. The superuser can cancel any message. An
       attempt to cancel a message will fail if the message has already been sent (of course), or if a delivery attempt is currently in progress.
       Because a delivery attempt is usually started as soon as an E-mail message is added to the mail queue, a cancellation attempt is only
       effective if the message cannot be immediately delivered for some reason, or if the system is very busy and is working on a mail backlog.
       cancelmsg works by marking all pending recipients as undeliverable. A non-delivery report is then generated and sent in the normal fashion.

       msgid is the message queue id that can be obtained from the mailq(1)[1], command. A reason is optional. The message does not disappear into
       a black void. The message will be returned as undeliverable, citing reason. A generic error message will be used if reason is not
       specified.

BUGS

       A non-delivery report may not be sent immediately, but delayed until the message's turn comes up in the scheduling queue.

       There is no immediate indication if the message cancellation worked. A subsequent non-delivery report is the only indication of a
       successful cancel. If it doesn't come, it means the message wasn't cancelled in time.

       A non-delivery report will not be sent for recipients whose delivery status notification does not include the FAIL notice.

SEE ALSO

       mailq(1)[1], courier(8)[2].

AUTHOR

       Sam Varshavchik
	   Author

NOTES

	1.

	   mailq(1)
	   [set $man.base.url.for.relative.links]/mailq.html

	2.

	   courier(8)
	   [set $man.base.url.for.relative.links]/courier.html

Courier Mail Server						    08/30/2011							      CANCELMSG(1)
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