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<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)
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