<!doctype html public "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=us-ascii"> <title> Postfix manual - postlock(1) </title> </head> <body> <pre> POSTLOCK(1) POSTLOCK(1) <b>NAME</b> postlock - lock mail folder and execute command <b>SYNOPSIS</b> <b>postlock</b> [<b>-c</b> <i>config</i><b>_</b><i>dir</i><b>] [-l</b> <i>lock</i><b>_</b><i>style</i><b>]</b> <b>[-v</b>] <i>file command...</i> <b>DESCRIPTION</b> The <a href="postlock.1.html"><b>postlock</b>(1)</a> command locks <i>file</i> for exclusive access, and executes <i>command</i>. The locking method is compatible with the Postfix UNIX-style local delivery agent. Options: <b>-c</b> <i>config</i><b>_</b><i>dir</i> Read the <a href="postconf.5.html"><b>main.cf</b></a> configuration file in the named directory instead of the default configuration directory. <b>-l</b> <i>lock</i><b>_</b><i>style</i> Override the locking method specified via the <b><a href="postconf.5.html#mailbox_delivery_lock">mail</a>-</b> <b><a href="postconf.5.html#mailbox_delivery_lock">box_delivery_lock</a></b> configuration parameter (see below). <b>-v</b> Enable verbose logging for debugging purposes. Mul- tiple <b>-v</b> options make the software increasingly verbose. Arguments: <i>file</i> A mailbox file. The user should have read/write permission. <i>command...</i> The command to execute while <i>file</i> is locked for exclusive access. The command is executed directly, i.e. without interpretation by a shell command interpreter. <b>DIAGNOSTICS</b> The result status is 75 (EX_TEMPFAIL) when <a href="postlock.1.html"><b>postlock</b>(1)</a> could not perform the requested operation. Otherwise, the exit status is the exit status from the command. <b>BUGS</b> With remote file systems, the ability to acquire a lock does not necessarily eliminate access conflicts. Avoid file access by processes running on different machines. <b>ENVIRONMENT</b> <b>MAIL_CONFIG</b> Directory with Postfix configuration files. <b>MAIL_VERBOSE</b> Enable verbose logging for debugging purposes. <b>CONFIGURATION PARAMETERS</b> The following <a href="postconf.5.html"><b>main.cf</b></a> parameters are especially relevant to this program. The text below provides only a parameter summary. See <a href="postconf.5.html"><b>postconf</b>(5)</a> for more details including exam- ples. <b>LOCKING CONTROLS</b> <b><a href="postconf.5.html#deliver_lock_attempts">deliver_lock_attempts</a> (20)</b> The maximal number of attempts to acquire an exclu- sive lock on a mailbox file or <a href="bounce.8.html"><b>bounce</b>(8)</a> logfile. <b><a href="postconf.5.html#deliver_lock_delay">deliver_lock_delay</a> (1s)</b> The time between attempts to acquire an exclusive lock on a mailbox file or <a href="bounce.8.html"><b>bounce</b>(8)</a> logfile. <b><a href="postconf.5.html#stale_lock_time">stale_lock_time</a> (500s)</b> The time after which a stale exclusive mailbox lockfile is removed. <b><a href="postconf.5.html#mailbox_delivery_lock">mailbox_delivery_lock</a> (see 'postconf -d' output)</b> How to lock a UNIX-style <a href="local.8.html"><b>local</b>(8)</a> mailbox before attempting delivery. <b>RESOURCE AND RATE CONTROLS</b> <b><a href="postconf.5.html#fork_attempts">fork_attempts</a> (5)</b> The maximal number of attempts to fork() a child process. <b><a href="postconf.5.html#fork_delay">fork_delay</a> (1s)</b> The delay between attempts to fork() a child process. <b>MISCELLANEOUS CONTROLS</b> <b><a href="postconf.5.html#config_directory">config_directory</a> (see 'postconf -d' output)</b> The default location of the Postfix <a href="postconf.5.html">main.cf</a> and <a href="master.5.html">master.cf</a> configuration files. <b>SEE ALSO</b> <a href="postconf.5.html">postconf(5)</a>, configuration parameters <b>LICENSE</b> The Secure Mailer license must be distributed with this software. <b>AUTHOR(S)</b> Wietse Venema IBM T.J. Watson Research P.O. Box 704 Yorktown Heights, NY 10598, USA POSTLOCK(1) </pre> </body> </html>