change no of lines after and before in git diff output

Question

I want to increase the number of lines displayed before and after changes in git diff output.

Analogous to grep -A3 -B5 ...

Answer 1

You can use the -U switch to control the number of lines of context around the diff:

$ git diff -U5

Answer 2

According to git diff --help, git diff supports the same arguments as the standard diff command w/r/t context:

   -U<n>, --unified=<n>
       Generate diffs with <n> lines of context instead of the usual three. Implies
       -p.