It seems I have lost the thread.
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Think I realised what the Cat means cat - concatenate files and print on the standard output https://linuxcommand.org/lc3_man_pages/cat1.html
I donât have any clue why I have problems with logging in here. This time, a âbad gatewayâ error occurred. Sometimes I think that my keyboard must be damagedâŚ
Iâm more of a tac type. 
Good morning Jonas, itâs very early.
MLS stands for Multilevel security and is the fourth part of an SELinux context. This sensitivity label is not always enabled by default on every Linux distribution. Itâs optional. Sensitivity labels allow the classification of resources and the restriction of access to those resources based on security clearance.
Have a nice day,
Ralf
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