|Comparing and Merging Files with GNU diff and patch|
by David MacKenzie, Paul Eggert, and Richard Stallman
Paperback (6"x9"), 120 pages
RRP £12.95 ($19.95)
"Well packaged... the quality of information is excellent" --- Linux User and Developer Magazine (Issue 36, Feb 2004) Get a printed copy>>>
The format for running the
diff command is:
diff options... files...
In the simplest case, two file names from-file and
to-file are given, and
diff compares the contents of
from-file and to-file. A file name of ‘-’ stands for
text read from the standard input. As a special case, ‘diff - -’
compares a copy of standard input to itself.
If one file is a directory and the other is not,
the file in the directory whose name is that of the non-directory.
The non-directory file must not be ‘-’.
If two file names are given and both are directories,
diff compares corresponding files in both directories, in
alphabetical order; this comparison is not recursive unless the
--recursive option is given.
compares the actual contents of a directory as if it were a file. The
file that is fully specified may not be standard input, because standard
input is nameless and the notion of "file with the same name" does not
--from-file=file option is given, the number of
file names is arbitrary, and file is compared to each named file.
Similarly, if the
--to-file=file option is given, each
named file is compared to file.
diff options begin with ‘-’, so normally file names
may not begin with ‘-’. However,
-- as an
argument by itself treats the remaining arguments as file names even if
they begin with ‘-’.
An exit status of 0 means no differences were found, 1 means some differences were found, and 2 means trouble.
|ISBN 0954161750||Comparing and Merging Files with GNU diff and patch||See the print edition|