md(1)							    BSD General Commands Manual 						     md(1)

NAME

     md -- process raw dependency files produced by cpp -MD

SYNOPSIS

     md [-d] [-f] [-m makefile] [-u makefile] [-o outputfile] [-v] [-x] [-D c|d|m|o|t|D]

DESCRIPTION

     The md command basically does two things:

     Process the raw dependency files produced by the cpp -MD option.  There is one line in the file for every #include encountered, but there are
     repeats and patterns like .../dir1/../dir2 that appear which should reduce to .../dir2.  md canonicalizes and flushes repeats from the depen-
     dency list.  It also sorts the file names and "fills" them to a 78 character line.

     md also updates the makefile directly with the dependency information, so the .d file can be thrown away (see d option).  This is done to
     save space.  md assumes that dependency information in the makefile is sorted by .o file name and it procedes to merge in (add/or replace [as
     appropriate]) the new dependency lines that it has generated.  For time efficiency, md assumes that any .d files it is given that were cre-
     ated before the creation date of the "makefile" were processed already.  It ignores them unless the force flag [f] is given.

FLAG SUMMARY

     -D c|D|d|m|o|t
	     Specify debugging option(s):

	     c	     show file contents

	     D	     show very low level debugging

	     d	     show new dependency crunching

	     m	     show generation of makefile

	     o	     show files being opened

	     t	     show time comparisons

     -d      Delete the .d file after it is processed

     -f      Force an update of the dependencies in the makefile, even if the makefile is more recent than the .n file.  (This implies that md has
	     been run already.)

     -m makefile
	     Specify the makefile to be upgraded.  The defaults are makefile and then Makefile.

     -o outputfile
	     Specify an output file (other than a makefile) for the dependencies.

     -u makefile
	     Like -m, but the file will be created if necessary.

     -v      Set the verbose flag.

     -x      Expunge old dependency information from the makefile.

SEE ALSO

     make(1)

BUGS

     Old, possibly not used by anyone.

HISTORY

     The md utility was written by Robert V. Baron at Carnegie-Mellon University.

BSD
								   June 2, 2019 							       BSD