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#!/usr/bin/perl -w
                                                                      
+          
# Strict
...

__END__
foo

#!/usr/bin/perl -w
                                                                      
+          
...

__END__
foo

$ cp z.pl /ram; perl /ram/z.pl
Check file before unlink
...
$ df -k /ram
Filesystem           1K-blocks      Used Available Use% Mounted on
none                       100         0       100   0% /ram