I can relate to acronyms and abbreviations much more readily when I actually know how they were derived.
It is oftn pssble to wrk out wht an abrvtion means if you know the the root words behind it... but unfortunately
etc is a standard abbreviation for "et-cetera"... and for
usr I think of "user"... but I can't see any correlation.
Most of the terse names in Linux actually make sense when I finally work out the expanded original normal words behind them..
Are the origins of these abbreviations lost in the mists of time, or are they "obvious" to all but me?
This question was prompted by a comment I read yesterday, where someone described these things as Linux incantations ... I sympathize with him :)...