Postfix Mail Queue admin Commands
Here are a few useful commands for managing a Postfix Email Server Mail Queues. List queued emails (detailed): mailq postqueue -p Show email information: postcat -q Email_ID …
Tom Salmon
tomsalmon.com
Latest posts
OCR on Linux at the command line
Perform Optical Character Recognition on Linux quite simply with the cuneiform package. apt-get install cuneiform For example: cuneiform --singlecolumn -o output.txt image.png The recognised text is written to output.txt. Corrections to the outputted text may be necessary.
Speeding up and reducing resolution of videos
Sometimes it is necessary to speed up videos and/or reduce the resolution. This will typically result in a much smaller file size. ffmpeg and avconv allow video file manipulation on the command line. These commands work on Debian, and will likely work on Ubuntu and other Linux distributions. Speed up video, 2× speed:…
Quick and dirty introduction to GnuPG (GPG) on Linux
It’s a few simple steps to create GPG encryption keys and use these for signing and encrypting files and emails. Create a new pair of public/private cryptographic keys: user@yourhost:~$ gpg --gen-key … follow the prompts use the defaults if unsure…
France 2024
Date: September 2024 Duration: 6 Days Distance: 1,110 km Within half an hour of leaving home, we are already in France, our one and only destination country on this tour. However France is a big…
Balkans Tour 2024
Date: June 2024 Duration: 12 Days Distance: 3,082 km First stop is Bled in Slovenia, yet again. From Karlsruhe, it's perfectly placed for the first night away on a tour to south-east Europe. 670km is a good day's ride, and it puts me on the southern side of the Alps, with Croatia, Bosnia and Serbia…
Mounting partitions (ext4 and LVM2) inside a ‘dd’ image
A hard disk image may be taken using 'dd' or a similar too. This image can be used for later analysis or recovery. The image exists as a single file: image.img # fdisk -lu image.img Disk image.img: 953.87 GiB, 1024209543168 byt…
Implementing IPv6 Privacy Extensions (RFC4941)
IPv6 auto configuration on Linux will normally assign the same address every time when connecting to a specific network. This address would normally be formed from the network prefix and local interface MAC address. When using IPv4 your identity is slightly masqued by NAT. Although your single public IP address may be tracked, it is […]
Greece to Germany via Bulgaria and Serbia
Date: July 2022 Duration: 2 weeks Distance: 3,585 km Yet again I have shipped my bike by truck, from Germany to Thessaloniki in Greece. I flew in a day beforehand, spent an afternoon and evening sightseeing before…
Slovenia
Unlike one of my typical tours, where I would travel along a roughly planned route spanning a few thousand kilometers, I am basing myself this summer in the touristic town of Bled for six nights and making tours from there as well as doing a bit of hiking and cycling around the area.