hello.pl is a file which works fine:
print "Hello World";
sleep(5);
When I convert that to hello.exe using par-packer, window will sleep for 5 sec but won't print "Hello World" - which is actually printed after 5 sec and window exits.
Any solution is appreciated. I want the print to be displayed for 5 sec.
That would be an issue of flushing the buffer to STDOUT. You can either manually flush before the sleep with
STDOUT->flush() # a specific instance of $filehandle->flush()
or you can ask that the that file handle be automatically flushed for you.
STDOUT->autoflush(1);
Also you can turn that off with a 0 as the parameter.
Lastly there's a less readable special variable $| which you can assign 1 to if you're doing some kind of one-liner or code-golfing.