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  1. or download this
    V1=/home/user
V2=$V1/test
V3=$V2/file.txt
  2. or download this
    Read variables
open my $vars, '<:utf8', "$Bin/vars.txt" or die $! ;

...
print "$V3\n";

close ($vars);
  3. or download this
    /home/user
/$V1/test
/$V2/file.txt
  4. or download this
    /home/user
/home/user/test
/home/user/test/file.txt