Add a clarification to the latest TIL

README.md

@@ -10,7 +10,7 @@ pairing with smart people at Hashrocket.
 
 For a steady stream of TILs, [sign up for my newsletter](https://crafty-builder-6996.ck.page/e169c61186).
 
-_1491 TILs and counting..._
+_1492 TILs and counting..._
 
 ---
 
@@ -1516,6 +1516,7 @@ _1491 TILs and counting..._
 - [Switch Versions of a Brew Formula](unix/switch-versions-of-a-brew-formula.md)
 - [Tell direnv To Load The Env File](unix/tell-direnv-to-load-the-env-file.md)
 - [Touch Access And Modify Times Individually](unix/touch-access-and-modify-times-individually.md)
+- [Undo Changes Made To Current Terminal Prompt](unix/undo-changes-made-to-current-terminal-prompt.md)
 - [Undo Some Command Line Editing](unix/undo-some-command-line-editing.md)
 - [Unrestrict Where ripgrep Searches](unix/unrestrict-where-ripgrep-searches.md)
 - [Update Package Versions Known By asdf Plugin](unix/update-package-versions-known-by-asdf-plugin.md)

unix/undo-changes-made-to-current-terminal-prompt.md

@@ -0,0 +1,20 @@
+# Undo Change Made to Current Terminal Prompt
+
+I frequently use a variety of ASCII command characters like `ctrl-u` to delete
+the entire line or `ctrl-a` to jump to the front of a long line so I can make
+some edits toward that side of the command or `ctrl-e` to jump to the end of
+the command for the same reason. I sometimes even use `ctrl-k` to delete
+everything after the cursor to the end of the line.
+
+What I didn't realize until now is that any of those commands the modify the
+current line of the termianl prompt plus regular typing and hitting the
+backspace are all _undoable_.
+
+So, if I just wiped out half the line (with `ctrl-k`) and I immediately regret
+it, I can restore it with `ctrl-_`. The system keeps of history of the actions
+you've taken, so you can keep hitting `ctrl-_` to undo even further.
+
+The `ctrl-/` command does the same, per GNU's [Undo Changes in the Emacs
+docs](https://www.gnu.org/software/emacs/manual/html_node/emacs/Basic-Undo.html).
+
+[source](https://jvns.ca/ascii)