Diff two files with powershell

Compare-Object -ReferenceObject $(Get-Content f1.txt) -DifferenceObject $(Get-Content f2.txt)

Produce html diff with diff2html-cli

It is handy to do with one nice JavaScript tool, which works on any platform:
https://www.npmjs.com/package/diff2html-cli

> npm install diff2html-cli
> diff -u fileA.txt fileB.txt | diff2html -F diff.html -i stdin

It is important to have -u option for diff command you pipe into diff2html, because it produces unified diff and diff2html expects unified diff.

It is also possible to do these two commands separatedly, without piping:

Write diff of a and b into a-b.diff file:
> diff -u a.txt b.txt > a-b.diff

Produce HTML file from the diff file:
> diff2html -F a-b.html -i file -- a-b.diff

copy all GIT diff files on windows

Windows CMD one-line command to copy difference of two GIT commits into specific directory preserving directories hierarchy:

git diff --name-only yrc0m1 yrc0m2|sed s:/:\\:g > report.txt && for /F %F in ('cat report.txt') do xcopy %F c:\m1m2diff\%F && del report.txt

*xcopy will ask you to confirm wither the path is file or directory for each of your changed files. As far as diff returns only files changed, you can just do long F button press :-) Unfortunately I did not succeed to find a flag to suppress this warning with F option.

It consists of following subcommands:
1. git diff --name-only yrc0m1 yrc0m2 - returns list of changed files between commits yrc0m1 and yrc0m2;
2. sed s:/:\\:g - piped with | after previous one, converting Linux slashes to windows slashes;
3. > report.txt - oputput of previous two commands: all relative filepaths are saved in report.txt;
4. for /F %F in ('cat report.txt') do xcopy %F c:\m1m2diff\%F - iterates through lines in report.txt and copying file creating all not-existing directories from it's relative path (we suppose that c:\m1m2diff\ directory already exists)
5. del report.txt - simply deletes report.txt file.