ls  - list files

ls -l

-rw-rw-r--   1 jack net_user   512   Dec 14 16:16 afile.txt
drw-rw-r--   1 jack net_user   3072  Oct 12 11:42 folderx

  -rw-rw-r--    indicates a file's type and permissions
  drw-rw-r--    same as above but the d indicates directory
  1             indicates the number of links to the file
  jack          is the user ID of the file's owner
  net_user      is the group ID of the group that the owner belongs
  512           is the size of the file in bytes
  Dec 14 16:16  is the time stamp (last modified)
  afile.txt     is the name of the file
  d--------     indicates a directory


Switches:

  -f  directory/ exefile* regfile.txt	(/ *)
  -u  used with -l to see last access instead of last modified
  -s  used with -l to see size in blocks instead of bytes
  -t  sorts output by time stamp instead of name. w/-u does access
  -r  reverses output use with -t to reverse time/access stamp out
  -x  multi-column output

Other:

  ls [a-ch]*   - list all file beginning w/a,b,c,h.

  ls [a-z].??  - list all file beginning with alpha-char and two char ext