01-01-2020
I am largely with Neo - depending on what file you are modifying, you might not even need a backup copy at all. For example, I often create feeding files for loops - and afterwards modify them (add or remove things) - these are my very own files and I usually can recreate them very easily if I ever have to - so these I modify without any backups. System files however should always be modified after a copy - ideally a copy where ownership and permissions are the same as the original - so if anything ever goes wrong - all you have to do is rename the original file to something like .old and your copy to the original filename.
BTW - in 32 years, I have not lost a single file to a system crash.
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LEARN ABOUT MOJAVE
gendiff
GENDIFF(1) General Commands Manual GENDIFF(1)
NAME
gendiff - utility to aid in error-free diff file generation
SYNOPSIS
gendiff <directory> <diff-extension>
DESCRIPTION
gendiff is a rather simple script which aids in generating a diff file from a single directory. It takes a directory name and a "diff-
extension" as its only arguments. The diff extension should be a unique sequence of characters added to the end of all original, unmodi-
fied files. The output of the program is a diff file which may be applied with the patch program to recreate the changes.
The usual sequence of events for creating a diff is to create two identical directories, make changes in one directory, and then use the
diff utility to create a list of differences between the two. Using gendiff eliminates the need for the extra, original and unmodified
directory copy. Instead, only the individual files that are modified need to be saved.
Before editing a file, copy the file, appending the extension you have chosen to the filename. I.e. if you were going to edit somefile.cpp
and have chosen the extension "fix", copy it to somefile.cpp.fix before editing it. Then edit the first copy (somefile.cpp).
After editing all the files you need to edit in this fashion, enter the directory one level above where your source code resides, and then
type
$ gendiff somedirectory .fix > mydiff-fix.patch
You should redirect the output to a file (as illustrated) unless you want to see the results on stdout.
SEE ALSO
diff(1), patch(1)
AUTHOR
Marc Ewing <marc@redhat.com>
4th Berkeley Distribution Mon Jan 10 2000 GENDIFF(1)