Congrats on 'use warnings'!
The error is coming from:
if (-e glob '/abc/def/ghi/test*') # line 4
For the case where the 'glob' returns an empty array undef (i.e. test* does not exist).
You should break that into two tests:
my @tests;
if (@tests = glob '/abc/def/ghi/test*' and -e $tests[0]) {# line 4
All power corrupts, but we need electricity.
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