Mac OS X Panther in a Nutshell, 2nd Edition

Name

diff

Synopsis

diff 
  [ -k kflag ] 
  [ -l | -R ] 
  [ format ] 
  [ [ -r rev1 | -D date1 ] [ -r rev2 | -D date2 ] ] 
  [ file ... ]

Compare two versions of a file, and display the differences in a format determined by the options. By default, the sandbox version of the file is compared to the repository version it was originally copied from.

The standard meanings of the common client options -D, -k, -l, -r, and -R apply. All options for the diff command can also be used.