usage diff and patch [debian,ubuntu]

based on:
http://devdiary.org/kurzetipps-die-befehle-diff-und-patch/

create a patch:
diff -uNr „main.c“ „main_patch.c“ > „main_patch.diff“

apply a patch:
patch -p1 „main.c“ < „main_patch.diff“

reverse the patch:
patch -R -p1 „main.c“ < „main_patch.diff“

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