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Shrink Proxmox LVM root partition and extend data partition

Reducing the size of /dev/pve/root (the root logical volume in a default Proxmox setup using LVM) and extend the space of /dev/pve/data can be done using SystemRescueCD (or any live Linux environment with LVM and filesystem tools).

This i ...

Extract all destinations (email recipients) from Postfix queue

To extract all destinations (i.e., the recipients) from the Postfix mail queue (mailq), you can use the following Bash one-liner:

mailq | awk '/^[A-F0-9]/ {in_msg=1; next} in_msg && /^[ \t]*[^ ]+@[^ ]+/ {print $1}' | sort | uniq

E ...

How to configure OpenDKIM with Postfix on Debian 12 (bookworm)

Here is a step by step guide to configure OpenDKIM with Postfix on Debian 12 bookworm.

We're gonna modify default configuration files to keep only minimal or required settings.

Install openDKIM

sudo apt-get install opendkim opendkim-tools

Conf ...

Linux find total usage of files older than specified number of days

Sometimes I need to calculate a total disk usage of files older than a specified interval (days, months, years).


Here is a 1 liner to do that:

find . -type f -mtime +7 -print0 | du -hc --files0-from - | tail -n 1


Detailed info ?

Use

Email archiving with MailPiler 1.3.x on Debian 8 Jessie

If you are in a search for an email archiving solution, MailPiler is a recommend solutions.

If you didn't heard about MailPiler, check out the comparison with MailAr ...

Detecting CSV delimiter with PHP

Excel doesn't do a very good job on exporting comma separated files (CSV or TXT). Reading the file with fgetcsv could fail, since the field separator might not be as expected (a comma).

Here is a quick method to find the field delimiter from a CSV file. We'l ...