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$ cat pm_1219033_test_data.txt
0 1 2 3
a b c d
() {} [] <>

$ cat pm_1219033_test_shebang.pl
#!/usr/bin/perl -lan
...
use warnings;

print $F[2];

$ ./pm_1219033_test_shebang.pl pm_1219033_test_data.txt
2
c
[]

$ cat ./pm_1219033_test_script.pl
print "hello\n";
...
$ perl -e 'print "hello\n";'
hello
$

$ perl -lane 'print $F[2]' pm_1219033_test_data.txt
2
...
a b c
() {} []
$