"${!var}"
*Expand the value of the parameter named by the value of the parameter var*.
This is *bad practice*! This expansion makes your code highly
non-transparent and unpredictable in the future. You probably want an
associative array instead.

from: http://mywiki.wooledge.org/BashSheet#Parameter_Operations
see also: http://mywiki.wooledge.org/BashFAQ/073
and: http://wiki.bash-hackers.org/syntax/pe



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