files,s,a,,,,list of files to be created or touched
create,b,h,yes,,,create file if it doesn't exist?
atime,b,h,yes,,,update file access time?
mtime,b,h,yes,,,update file modification time?
time,s,h,"",,,time to set (empty for current time)
ref_file,s,h,"",,,reference file for times
verbose,b,h,no,,,verbose output flag