Oneliners

How to remove mail from Postfix queue

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MyszaSometimes you need to remove some mail from queue or do other things in shell. For experienced administrators this is not a problem, but I decided to write some usable shell commands and scripts for less experienced users.

Here are few commands to remove mail from Postfix queue. Don’t ask me why – just for example. This time i will describe it step by step. This is mail queue:

# mailq
-Queue ID- --Size-- ----Arrival Time---- -Sender/Recipient-------
571AAC45      48204 Tue Dec 21 07:52:39  MAILER-DAEMON
                (connect to example.com[221.X.X.70]:25: Connection refused)
                                         datadm@example.com
...

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Masowe snapshoty ZFS

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ZFS is very friendly filesystem. You can do a snapshot quick and easy. For example, if you have ZFS named tank, you can do snapshot named snap1: # zfs snapshot tank@snap1 Done. But what if you have several pools and several ZFS filesystems on each? You can do a simple loop: # for a in … Read more