permission list by McBusLuck

a=({-,r}{-,w}{-,x})
eval 'echo 0$['b={0..7}]\$[c={0..7}]\$[d={0..7}]' is -${a[b]}${a[c]}${a[d]}
'

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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