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  1. or download this
    use strict;
use warnings;
...
print "started $$\n";
sleep 300;
__DATA__
  2. or download this
    $ ./761299.pl
started 1220690
...
[1]    Terminated                    ./761299.pl
$ ./761299.pl
started 1220692
  3. or download this
    kfcntl(3, F_SETLK, 0x2FF22430)   = 0              # when not already r
+unning

kfcntl(3, F_SETLK, 0x2FF22430)   Err#13 EACCES    # otherwise