Change the position of program lead to syntax error - perl

Question

I have a program called shuffle.pl . When I use perl shuffle.pl Input Shuffled to execute , it success work and show no error .
I create a directory called ./tools under my home directory , and I set this path to .cshrc . So I can execute the program without typing perl to execute . ( This is my first time to do this , maybe some wrong in here)
But when I move the shuffle.pl to ~/.tools and execute . it show I have error in line 5 . But if I use perl ~/.tools/shuffle.plit can work . So it means it should have no syntax error in my program ,But why it can't work after I put my program to ~/.tools
error message
.tools/shuffle.pl: 5: Syntax error: "(" unexpected
.cshrc
set path = (. ~ ~/.tools /sbin /bin /usr/sbin /usr/bin /usr/games /usr/local/sbin /usr/local/bin )
thanks
here is my program
#!/usr/bin/perl
use strict;
use warnings;
use List::Util qw(first max maxstr min minstr reduce shuffle sum);
open(my $fh,"<","$ARGV[0]");
my #Lines = readline($fh);
my #Shuffled = shuffle(#Lines);
close $fh;
open(my $shuf,">","$ARGV[1]");
print $shuf #Shuffled;
close $shuf;

Answer 1

The shebang is used to tell which interpreter should be used for this script. For this to work, the magic number #! has to appear at the immediate beginning of the file. Otherwise, the default interpreter is used.
In this case, the shebang was preceded by a few empty lines. They have to be removed.
The shebang is not parsed when an explicit interpreter is used to execute the file, E.g. in $ perl script.pl.
It is only important when launched as executable: ./script.pl. In that case, the kernel is left to figure out what to do with it: Load into memory as compiled program? Launch an interpreter? Which one? Magic numbers like #! resolve this.
In general, if the shebang doesn't work, the following possible errors can be checked:
An UTF byte order mark precedes the #!.
Diagnosis: A hexdump shows FE FF at the beginning.
Solution: configure your editor to store files without a BOM
The script is encoded in such a way that the beginning does not decode to #! as ASCII.
Diagnosis: The file does not begin with #! when opened as ASCII or does not begin with 23 21 in a hexdump. Or your editor shows UTF-16 or UTF-32 as the encoding.
Solution: Store the script in ASCII-compatible encoding. UTF-8 is an especially good choice.
Non-native line endings can be confused to be part of the executable name. E.g. with windows line endings, the shebang in
#!/usr/bin/perl
print 1;
could be taken as the interpreter name "/usr/bin/perl\r". Many filesystems allow line endings inside filenames.
Diagnosis: A hexdump shows something other than a space (20) or newline (0A) after the executable name.
Solution: Convert line endings to Unix.

Answer 2

A few general tips:
You should have -w on the shebang line to catch warnings.
You should probably use strict; also.
Don't put double quotes around "$ARGV[0]" and "$ARGV[1]" because they serve no purpose.
Use "do or die" syntax on the file opens, e.g.:
open (File, "<", $ARGV[0]) || die "File open error: $!";
Do those things and I am pretty sure the solution will appear rapidly.