How to call / execute shell / external command from Java

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Runtime.getRuntime().exec can be used to executes the specified string command in a separate process. In general it is better to use ProcessBuilder API. Example


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How to delete / clear queue of PowerMTA

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To delete / clear queue of PowerMTA: Use pmta delete

Syntax :

 pmta delete [--dsn] [--queue=domain[/vmta] [--orig=addr] [--rcpt=addr]
[--jobId=id] [--envId=id] [--accounting]
Description :
Deletes recipients from the queue. Although "--queue"'s default is */*, the command
requires either --queue or --jobId to be entered explicitly, so that an accidental "pmta
delete" command doesn't delete the entire queue. Messages are marked in the accounting
file as deleted by administrator.

Options :
--dsn
specifies that a DSN report should be sent. Using this option may slow the
deletion process. No entry is written to the accounting file unless the --accounting
flag is used as well.
--accounting
specifies that deletion information should be written to the accounting file. Using
this option may slow the deletion process.
--queue
specifies which queue(s) to delete from, and defaults to all queues.
--orig
specifies that only recipients with the MAIL FROM address be delete…
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