Add Summarize Amount Of Change For Specific Commit as a Git TIL

README.md

@@ -10,7 +10,7 @@ working across different projects via [VisualMode](https://www.visualmode.dev/).
 
 For a steady stream of TILs, [sign up for my newsletter](https://visualmode.kit.com/newsletter).
 
-_1881 TILs and counting..._
+_1882 TILs and counting..._
 
 See some of the other learning resources I work on:
 
@@ -457,6 +457,7 @@ If you've learned something here, support my efforts writing daily TILs by
 - [Stash Everything](git/stash-everything.md)
 - [Stashing Only Unstaged Changes](git/stashing-only-unstaged-changes.md)
 - [Stashing Untracked Files](git/stashing-untracked-files.md)
+- [Summarize Amount Of Change For Specific Commit](git/summarize-amount-of-change-for-specific-commit.md)
 - [Switch To A Recent Branch With FZF](git/switch-to-a-recent-branch-with-fzf.md)
 - [Transition A Branch From One Base To Another](git/transition-a-branch-from-one-base-to-another.md)
 - [Turn Off The Output Pager For One Command](git/turn-off-the-output-pager-for-one-command.md)

git/summarize-amount-of-change-for-specific-commit.md

@@ -0,0 +1,31 @@
+# Summarize Amount Of Change For Specific Commit
+
+To get a quick headline summary of the amount of change that happened in a
+commit, I can use the `--shortstat` flag. This will sum up file changed, lines
+added, and lines removed. This can be combined with an _empty_ format flag to
+suppress all other output.
+
+I can run this for the latest commit on the current branch by referencing
+`HEAD`.
+
+```bash
+❯ git show --shortstat --format= HEAD
+ 3 files changed, 1046 insertions(+), 462 deletions(-)
+```
+
+Or I can point at some other commit via its SHA:
+
+```bash
+❯ git show --shortstat --format= 8cbfcdd7
+ 1 file changed, 238 insertions(+)
+```
+
+I can even summarize the amount of change for the entire feature branch I'm
+working on by referencing a range between `main` and the `HEAD` commit.
+
+```bash
+❯ git diff --shortstat main...HEAD
+ 36 files changed, 1125 insertions(+), 134 deletions(-)
+```
+
+See `man git-show` and `man git-diff` for more details.