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open(MYFILE, ">>$myfile") || die "Can't append to $myfile, Perl says $
+!";
flock(MYFILE, 2) || die "Can't lock $myfile, Perl says $!";
print MYFILE "Hello World!\n";
close MYFILE;

for ($i=0; defined($i); $i++){
    print "Help! I'm trapped in an infinite loop\n";
}

while (1) {
   print "foo";
...
for (;;) {
   print "foo"
}