Dec 102017
Cdiff file comparison utilities.
File CDIFF.ZIP from The Programmer’s Corner in
Category Word Processors
Cdiff file comparison utilities.
File Name File Size Zip Size Zip Type
CDIFF.DOC 3072 1253 deflated
CDIFF.EXE 16640 8461 deflated
HELP 12489 4003 deflated
HELP.BAT 118 93 deflated
HELP.EXE 44333 24605 deflated

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Contents of the CDIFF.DOC file


C-Diff is a differential file comparer.


C-Diff [ -befh ] file1 file2

C-Diff tells what lines must be changed in two files to
bring them into agreement. If file1 (file2) is -, the
standard input is used. If file1 (file2) is a directory,
then a file in that directory whose filename is the same as
the filename of file2 (file1) is used. The normal output
contains lines in these forms:

n1 a n3,n4
n1,n2 d n3
n1,n2 c n3,n4

These lines resemble ed(1) commands to convert file1
into file2. The numbers after the letters pertain to file2.
By exchanging a for d and reading backward, conversion of
file2 into file1 is given. As in ed, identical pairs where
n1 = n2 or n3 = n4 are abbreviated as a single number.
Following each of these lines come all the lines that
are affected in the first file flagged by <, then all the
lines that are affected in the second file flagged by >.
Except in rare circumstances, C-Diff finds the smallest
sufficient set of file differences.

-b Causes trailing blanks (spaces and tabs) to be
ignored and other strings of blanks to compare

-e Produces a script of a, c, and d commands for
the editor ed, which recreates file2 from file1.

-f Produces a similar script, not useful with ed,
in the opposite order.

In connection with -e, the following shell program can
help maintain multiple versions of a file. Only an ancestral
file ($1) and a chain of version-to-version ed scripts
($2,$3,...) made by C-Diff need be on hand. The latest
version appears on the standard output.

(shift; cat $*; echo '1,$p') | ed - $1

-h Does a fast, but incomplete job. It works
only when changed parts are short and well
Options -e and -f are unavailable with -h.

% cat list1 % cat list2
boat boa
boathouse boar
boatload board
boatman boardinghouse
boatmen boast
boatyard boat

% C-Diff list1 list2
> boa
> boar
> board
> boardinghouse
> boast
< boatyard

Exit status is 0 for no differences, 1 for some, 2
for trouble.

Edited scripts produced under the -e or -f option are
unable to create lines consisting of a single period
(.). The script file is produced, but it will
produce incorrect results if run under ed.

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