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  1. or download this
    E:\>perldoc perlport|grep alarm
    alarm SECONDS
...
E:\>perl -le"alarm 0"
The Unsupported function alarm function is unimplemented at -e line 1.
  2. or download this
    E:\>perl
local $SIG{ALRM} = sub { die "alarm!!!!" };
...
alarm 0;
__END__
alarm!!!! at - line 1.