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    Command:

    postlock

    
    
    

    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 compatible 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 directory.
    
           -l lock_style
                  Override the locking method  specified  via  the  mailbox_deliv-
                  ery_lock configuration parameter (see below).
    
           -v     Enable  verbose  logging  for  debugging  purposes.  Multiple -v
                  options make the software increasingly verbose.
    
           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 inter-
                  pretation by a shell command interpreter.
    
    
    

    DIAGNOSTICS

           The result status is 75 (EX_TEMPFAIL) when postlock(1) could  not  per-
           form  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 neces-
           sarily  eliminate access conflicts. Avoid file access by processes run-
           ning 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  pro-
           gram.   The  text  below  provides  only a parameter summary. See post-
           conf(5) for more details including examples.
           mailbox_delivery_lock (see 'postconf -d' output)
                  How  to  lock  a  UNIX-style  local(8) mailbox before attempting
                  delivery.
    
    
    

    RESOURCE AND RATE CONTROLS

           fork_attempts (5)
                  The maximal number of attempts to fork() a child process.
    
           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  con-
                  figuration 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
    
                                                                       POSTLOCK(1)
    
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