Links from 2021-01-02

Enterprise presentations – Coté

True words

How to use Bash history commands

In Bash, the history command is capable of much more than what’s been covered here, but this is a good start for getting used to using your history instead of just treating it as a reference. Use the history command often, and see how much you can do without having to type commands. You might surprise yourself!

Zsh and Fish’s simple but clever trick for highlighting missing linefeeds – Vidar’s Blog

I recently noticed that zsh and fish will instead show a character indicating a missing linefeed, and still start the prompt where you’d expect to find it:

vidarholen-vm2% echo -n "hello zsh"
hello zsh%
vidarholen-vm2%

If you’re disappointed that this is what there’s an entire blog post about, you probably haven’t tried to write a shell. This is one of those problems where the more you know, the harder it seems

Why is there a "V" in SIGSEGV Segmentation Fault?

[…] the signal name stands for "Segmentation Violation".
So it’s essentially: SIGnal SEGmentation Violation.

But there’s more!

Originally the signal was called SIGSEG. It was subsequently renamed SIGSEGV
in the userspace and a bit later - around 1980 - to SIGSEGV on the kernel
side.

Maersk, me & notPetya

Maersk is the world’s largest integrated shipping and container logistics company. I was massively privileged (no pun intended) to be their Identity & Access Management (IAM) Subject Matter Expert (SME), and later IAM Service Owner. Along with tens (if not hundreds) of others, I played a role in the recovery and cybersecurity response to the events of the well-publicised notPetya malware attack in 2017. I left Maersk in March 2019, and as is customary I wrote the obligatory thank you and goodbye note. But there was always a lot more to add. A story to tell.

Milestones of User Interface Design

In order to contribute to historical awareness in our field, we have compiled a list of interaction design classics. Our aim was to include examples that we find inspiring and insightful — which led to our greatest challenge, keeping in mind that we wanted to create a concise list — leaving things out. So, we decided to focus on productivity software — in a very broad sense — and to order the projects chronologically. We didn’t address user interfaces from games, websites or artistic projects; that really would have been too much.

Put your bash code in functions

Notice the line makepdf & makedoc & openapp. Here I am are running the 3 functions in parallel. The wait command does exactly that, waiting for the previous things to finish. When everything is done, the pdf file opens. Let’s look at the timing now:

real 0m24.677s
user 0m21.669s
sys 0m1.746s

It is running ~27% faster. Only by wrapping the code in different functions.

As an extra, in bash the code is not evaluated all at once. If you edit a script while it is being executed, the script behaves differently. Wrapping it in functions solves that problem too.

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„Leyrers Online Pamphlet“ ist die persönliche Website von mir, Martin Leyrer. Die hier veröffentlichten Beiträge spiegeln meine Ideen, Interessen, meinen Humor und fallweise auch mein Leben wider.
The postings on this site are my own and do not represent the positions, strategies or opinions of any former, current or future employer of mine.

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