C:\>test.pl
### Running a regular command ###
0s : Thread 0 - > Creating threads
1s : Thread 1 - Created
1s : Thread 2 - Created
1s : Thread 3 - Created
2s : Thread 0 - All Threads created
2s : Thread 0 - > Waiting for input now. All threads should finish now without pressing enter
4s : Thread 1 - Starting 'echo hello world'
4s : Thread 2 - Starting 'echo hello world'
4s : Thread 3 - Starting 'echo hello world'
4s : Thread 1 - Finished the command: hello world
4s : Thread 2 - Finished the command: hello world
4s : Thread 3 - Finished the command: hello world
<-- pressed enter here
7s : Thread 0 - > Input received, all done
7s : Thread 0 - All Threads joined

C:\>test.pl 1
### Running a perl script ###
0s : Thread 0 - > Creating threads
0s : Thread 1 - Created
0s : Thread 2 - Created
0s : Thread 3 - Created
1s : Thread 0 - All Threads created
1s : Thread 0 - > Waiting for input now. All threads should finish now without pressing enter
3s : Thread 1 - Starting 'perl -e "print \"hello world\""'
3s : Thread 3 - Starting 'perl -e "print \"hello world\""'
3s : Thread 2 - Starting 'perl -e "print \"hello world\""'
<-- pressed enter here
8s : Thread 0 - > Input received, all done
8s : Thread 1 - Finished the command: hello world
8s : Thread 3 - Finished the command: hello world
8s : Thread 2 - Finished the command: hello world
8s : Thread 0 - All Threads joined