GetOptions              Wrapper of the Perl module 'Getopt::Long' in R
GetoptLong              Wrapper of the Perl module 'Getopt::Long' in R
GetoptLong.options      Global options for GetoptLong()
get_scriptdir           Directory of current script
get_scriptname          File name of current script
qq                      Simple variable interpolation in texts
qq.options              Global options for qq() related functions
qqcat                   Print a string which has been intepolated with
                        variables
source_script           Source the R script with command-line arguments