$ ./sample -a sample001 -a = sample001 $ ./sample -b sample002 -b = sample002 $ ./sample -c sample003 -c = sample003 $ ./sample -d sample004 -d = sample004 $ ./sample -a sample001 -b sample002 -c sample003 -d sample004 -a = sample001 -b = sample002 -c = sample003 -d = sample004 $ ./sample -d sample004 -a sample001 -c sample003 -d = sample004 -a = sample001 -c = sample003 $ ./sample -h Usage: sampl