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POSTLOCK(1)                                    General Commands Manual                                    POSTLOCK(1)



NAME
       postlock - lock mail folder and execute command

SYNOPSIS
       postlock [-c config_dir] [-l lock_style]
               [-v] file command...

DESCRIPTION
       The  postlock(1) command locks file for exclusive access, and executes command. The locking method is compati‐
       ble with the Postfix UNIX-style local delivery agent.

       Options:

       -c config_dir
              Read the main.cf configuration file in the named directory instead of the default configuration  direc‐
              tory.

       -l lock_style
              Override  the  locking  method  specified  via  the  mailbox_delivery_lock configuration parameter (see
              below).

       -v     Enable verbose logging for debugging purposes. Multiple -v options make the software increasingly  ver‐
              bose.

       Arguments:

       file   A mailbox file. The user should have read/write permission.

       command...
              The  command  to  execute while file is locked for exclusive access.  The command is executed directly,
              i.e. without interpretation by a shell command interpreter.

DIAGNOSTICS
       The result status is 75 (EX_TEMPFAIL) when postlock(1) could not perform the requested operation.   Otherwise,
       the exit status is the exit status from the command.

BUGS
       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.

ENVIRONMENT
       MAIL_CONFIG
              Directory with Postfix configuration files.

       MAIL_VERBOSE
              Enable verbose logging for debugging purposes.

CONFIGURATION PARAMETERS
       The following main.cf parameters are especially relevant to this program.  The  text  below  provides  only  a
       parameter summary. See postconf(5) for more details including examples.

LOCKING CONTROLS
       deliver_lock_attempts (20)
              The maximal number of attempts to acquire an exclusive lock on a mailbox file or bounce(8) logfile.

       deliver_lock_delay (1s)
       fork_delay (1s)
              The delay between attempts to fork() a child process.

MISCELLANEOUS CONTROLS
       config_directory (see 'postconf -d' output)
              The default location of the Postfix main.cf and master.cf configuration files.

SEE ALSO
       postconf(5), configuration parameters

LICENSE
       The Secure Mailer license must be distributed with this software.

AUTHOR(S)
       Wietse Venema
       IBM T.J. Watson Research
       P.O. Box 704
       Yorktown Heights, NY 10598, USA



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