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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 char‐
     acter 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 appropri‐
     ate]) the new dependency lines that it has generated.  For time effe‐
     ciency, md assumes that any .d files it is given that were created before
     the creation date of the "makefile" were processed already.  It ignores
     them unless the force flag [f] is given.

FLAG SUMMARY
     -d delete the .d file after it is processed

     -f force an update of the dependencies in the makefile even though 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

     -u makefile like -m above, but the file will be created if necessary

     -o outputfile specify an output file for the dependencies other than a
     makefile

     -v set the verbose flag

     -x expunge old dependency info from makefile

     -D c|d|m|o|t|D subswitch for debugging.  can be followed by any of "c",
     "d", "m", "o", "t", "D" meaning:

	      c	      show file contents
	      d	      show new dependency crunching
	      m	      show generation of makefile
	      o	      show files being opened
	      t	      show time comparisons
	      D	      show very low level debugging

SEE ALSO
     make(1)

BUGS
     Old, possibly not used by anyone.

HISTORY
     The md utility was written by Robert V Baron at Carnegie-Mellon Univer‐
     sity.

BSD			       October 21, 2018				   BSD
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