diffmk(1)						      General Commands Manual							 diffmk(1)

NAME

       diffmk - Marks differences between files

SYNOPSIS

       diffmk [-b] [-ab'mark'] [-ae'mark'] [-cb'mark'] [-ce'mark'] [-db'mark'] [-de'mark'] file1 file2

       The diffmk command compares two versions of a file and creates a new file that marks the differences.

OPTIONS

       Uses  mark to mark where added lines begin.  Uses mark to mark where added lines end.  Ignores differences that are only changes in tabs or
       spaces on a line.  Uses mark to mark where changed lines begin.	Uses mark to mark where changed  lines	end.   Uses  mark  to  mark  where
       deleted lines begin.  Uses mark to mark where deleted lines end.

DESCRIPTION

       The  file1  and	file2 variables are the old and new versions of the file, respectively.  The diffmk command compares them and writes a new
       version to standard output, which can be redirected to a file. This output contains the lines  of  file2  marked  with  nroff  change  mark
       requests (.mc), or with the marks you specify with the -ab, -ae, -cb, -ce, -db, and -de options.

       When  output containing requests is formatted with nroff, changed or inserted lines are marked by a | (vertical bar) at the right margin of
       each line. An * (asterisk) indicates that a line was deleted.

       If the DIFFMARK environment variable is defined, it names a command string that diffmk uses to compare the files.  (Normally,  diffmk  uses
       the diff command.)  For example, you might set DIFFMARK to diff -h in order to better handle extremely large files.

EXAMPLES

       To mark the differences between two versions of a text file, enter: diffmk -ab'>I:' -ae'<I' -cb'>C' -ce'<C' -db'>D' -de'<D' 
	       chap1.old chap1 >chap1.diffs

	      This  causes diffmk to create a copy of chap1 called chap1.diffs, showing differences between chap1.old and chap1.  Additions of one
	      or more lines are marked with >I and <I, changed lines are marked with >C and <C, and deletions are marked with >D and <D.  To  mark
	      differences with nroff requests, enter: diffmk chap1.old chap1 > chap1.nroff

	      This  produces a copy of chap1 called chap1.nroff containing nroff change mark requests to identify text that was added to, changed,
	      or deleted from chap1.old.  To use different nroff marking requests and ignore changes in white space, enter:  diffmk   -b   -cb'.mc
	      %'  chap1.old  chap1  > chap1.nroff

	      This imbeds commands that mark changes with % (percent sign), additions with | (the default, because no -a option is specified), and
	      deletions with * (the default).  It does not mark changes that only involve a different number of spaces or tabs between words (-b).

SEE ALSO

       Commands:  diff(1), nroff(1)

																	 diffmk(1)