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List all files:

ls -la

Reverse sort:

ls -lr

Color: (dir blue, folders white)

ls --color


ls -lt
ls -ltr
       -c     with  -lt:  sort by, and show, ctime (time of last modification of file status information)
              with -l: show ctime and sort by name otherwise: sort by ctime

       -t     sort by modification time

       -u     with -lt: sort by, and show, access time with -l: show access time and sort by name
              otherwise: sort by access time

              like -l --time-style=full-iso

              with -l, show time as WORD instead of modification time: atime -u, access -u, use -u, 
              ctime -c, or status -c; use specified  time  as  sort
              key if --sort=time

              with  -l,  show  times  using  style STYLE: full-iso, long-iso, iso, locale, +FORMAT.
              FORMAT is interpreted like ‘date’; if FORMAT is FORMAT1<newline>FORMAT2, FORMAT1 applies
              to non-recent files and FORMAT2 to recent files; if STYLE is  prefixed  with  ‘posix-’,
              STYLE  takes effect only outside the POSIX locale

The times on files are:

  File: `sampledir/'
  Size: 4096            Blocks: 8          IO Block: 4096   directory
Device: 900h/2304d      Inode: 20447317    Links: 2
Access: (0755/drwxr-xr-x)  Uid: ( 1123/   23aaa)   Gid: ( 1123/   23aaa)
Access: 2010-11-29 15:30:01.000000000 -0700
Modify: 2010-05-19 08:00:01.000000000 -0600
Change: 2010-05-19 08:00:01.000000000 -0600