02-01-2017
-- "$@" just means, "take the following arguments literally" and "all the following arguments, properly separated and quoted". If your arguments are "a b" "c d" "e f", "$@" will put them in as "a b" "c d" "e f", not "a" "b" "c" "d" "e" "f".
The 'shift' eats a commandline argument, i.e. converts $1=a, $2=b, $3=c, $4=d into $1=b, $2=c, $3=d. shift 2 moves it all the way to $1=c, $2=d. It's done since that particular branch uses an argument, so it has to remove two things from the list (the -r and the argument following it) not just one.
I have no idea why they're doing 'eval set', only theories. That's dangerous and dumb. They may be trying to process quotes inside quotes.
They are getting the values from 'getopt', the standard way to handle commandline arguments. I can't really explain its workings, but I'm sure others can.
Last edited by Corona688; 02-01-2017 at 11:48 AM..
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