I am good enough @ Linux to be able to help out with Linux issues at my employer's IT department. However, I see I have some issues that separate me from real pros over there: usually it is just a single letter - or some tiny dot somewhere - that I usually omit, or forget to type.

I simply just don't recall the syntax as good as they, and need to look into man pages more often to get it right.

Is there a method how to better memorize, or is it just a matter of continuous practice?

I love Linux, but sometimes wish it were more systematic.

Practice makes perfect, then you realize there is alway something more to learn. Not sure what you mean by "systematic". I have been doing this for 2 decades and still google stuff...we all do, unless you admin Linux server farms for a living. I have a buddy that has been a Linux admin for 20 years and sometimes he still looks stuff up.

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Thanks - it is encouraging to learn that others also encounter similar issues.

What I meant by "unsystematic" is easily explained on the example of the difference between GNU core utilities and other programs.

Ah OK. This is because Linux is not built by a single team. It is the kernel, GNU utilities, then everything else. All of those pieces are built by completely separate individuals/teams. That's my guess anyway.