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use strict;
use warnings;
...
set file2=${playground}'/file2$'
set file3=${playground}'/f$i$l$e$3$'
set file4=${playground}'/fi\$le4'

1..5
ok 1 - set playground="myhome/playground"
...
#
ok 5 - set file4=myplay'/fi\$le4'
#