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  1. or download this
    package Script::Singleton;

...
sub __placeholder {}

1;
  2. or download this
    #!/usr/bin/perl
use warnings;
...
print "Starting script...\n";
sleep(10);
print "I can use \"Singleton.pm!\".\n";
  3. or download this
    me@/path/to/my/scripts/$ ./runTest.perl
Can't locate Script/Singleton.pm in @INC (you may need to install the 
+Script::Singleton module) (@INC contains: /etc/perl /usr/local/lib/x8
+6_64-linux-gnu/perl/5.30.0 /usr/local/share/perl/5.30.0 /usr/lib/x86_
+64-linux-gnu/perl5/5.30 /usr/share/perl5 /usr/lib/x86_64-linux-gnu/pe
+rl/5.30 /usr/share/perl/5.30 /usr/local/lib/site_perl /usr/lib/x86_64
+-linux-gnu/perl-base) at ./toy02.perl line 6.
BEGIN failed--compilation aborted at ./runTest.perl line 6.
me@/path/to/my/scripts/$