Your code is almost there, but you have to remove the semicolon:
my @answer;
return "File does not exist\n"; # <- extra semicolon!
unless -e $_;
The next problem is:
while (<>) {
If your program is named filetest.pl and you call it like:
./filetest.pl *.txt
that loop is actually going to read each line of all the *.txt files in your current directory, and unless each line actually happens to be the name of a file in that directory, your program will correctly tell you that the file does not exists!
Try adding some extra output (what is $_ ?)
cheers
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