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        Compare Files or Directories, Release 2.1.j

Usage:  diff [-bBefhiqrvw!-] [-m minmatch] [-Dstring] oldpath newpath

   diff produces a list of differences between two files or
   directories.  The working assumption is that newpath is a
   newer version of whatever's in oldpath.  If they're files,
   diff assumes they contain ascii text but if it encounters a
   file containing lots of binary data, it switches to a binary
   comparison mode to avoid dumping gibberish to the screen.

   Comparing files, diff looks for minimal sections of change.
   Each difference is shown as an add, delete or change with the
   appropriate line numbers or line number ranges for  each file.
   Following are texts of the differing section.  Lines that have
   been deleted are flagged with '<'; lines that have been added
   are flagged with '>'.  Alternately, diff can be used to produce
   merged listings with #ifdefs for the C compiler or highlighting
   for quick visual scanning.

   Comparing directories, the lists of files they contain all the
   way down through the tree are sorted, then compared.  If the
   same filename exists in each directory tree, a quick binary
   comparison is normally made to give a quick yes-or-no are they
   different.  If -r is specified, the diff text comparison is
   done recursively the whole way down the two trees.

   If one of the arguments to diff is a file and the other is a
   directory, diff will look for and compare against a file of
   the same name in the directory.

Options:

   -b           Blank spaces of any length compare equal.  Ignore
                any leading or trailing white space on each line.
   -B           Binary comparison even on text files.
   -Dstring     Produce a merged #ifdef'ed listing, with the string
                being defined meaning use the older version. (Newer
                version is intentionally the default.)
   -e           Turn off highlighting of empty lines.  By default,
                if highlighting is used to show areas of change,
                even empty lines will have Ansi sequences at the
                beginning and end so that if more is used to display
                the output with the default color stretch mode on,
                empty lines will still be highlighted.
   -f           Force diff-style comparison to continue even on files
                that appear to contain binary data.
   -h           Help.  (This screen.)
   -i           Ignore character case.
   -m minmatch  Minimum match length to insist on before resynchro-
                nizing two files.  (Default is 2 lines.)
   -q           Quiet:  suppress warnings about files containing
                binary data.
   -r           Recursively diff the contents of any subdirectories.
   -v           Verbose listing of all the contents of any entire
                subdirectory added or deleted.
   -w           White space is ignored totally.
   -!           Produce merged, highlighted version.  Text that's
                unchanged is normal, deleted text is red, new text
                is green.
   --           End of options.

Colors:

   You may set your own choices for screen colors using these
   environmental variables:

      Name         Use                             Default
      COLORS       Normal screen colors            White on Black
      ADDITIONS    Lines added                     Bright Green
      DELETIONS    Lines deleted                   Bright Red

   Colors recognized are black, red, green, yellow, blue, magenta
   (or red blue), cyan (or blue green) or white.  Foreground colors
   may also be bright or blink.  The names of the colors and the
   words bright, blink and on may be in either upper or lower or
   mixed case but the names of the environmental variables themselves
   must be all upper case.

   Either or both the foreground and background colors may be
   specified; if you don't specify a value, it's considered
   transparent and inherits the color underneath it.   ADDITIONS
   and DELETIONS inherit from COLORS.

Copyright (c) 1990-1993 by Hamilton Laboratories.  All rights reserved.