$ time perl -MGetopt::Std -e 1
0.07user 0.00system 0:00.07elapsed 97%CPU

$ time perl -MGetopt::Long -e 1
0.19user 0.05system 0:00.23elapsed 102%CPU

$ time perl -MGetopt::Declare -e 1
0.59user 0.08system 0:00.67elapsed 99%CPU

##</code><code>##

For example, given the parameter specifications:

            -+              Swap signs
            -a              Append mode
            -b              Bitwise compare
            -c <FILE>       Create new file
            +del            Delete old file
            +e <NICE:i>     Execute (at specified nice level) when complete

The following command-lines (amongst others) are all exactly equivalent:

            -a -b -c newfile +e20 +del
            -abc newfile +dele20
            -abcnewfile+dele20
            -abcnewfile +e 20del