ls

  -l	 print details. Default order: Name. Default time: Modification.
  -t	 sort. Default: Modification time. 
  -lt	 print and sort by modification time.
  -u	 access time.
  -lu	 print access time.
  -tu	 sort by access time.
  -ltu	 print and sort by access time.
  -s	 print size.
  -S     sort by size.
  -m     with a comma separated list of entries.
  -r     reverse order while sorting.