Add Reverse A Group Of Lines as a vim til.

README.md

@@ -286,6 +286,7 @@ smart people at [Hashrocket](http://hashrocket.com/).
 - [Repeat The Previous Change](vim/repeat-the-previous-change.md)
 - [Repeating Characters](vim/repeating-characters.md)
 - [Replace A Character](vim/replace-a-character.md)
+- [Reverse A Group Of Lines](vim/reverse-a-group-of-lines.md)
 - [Scrolling Relative to the Window](vim/scrolling-relative-to-the-window.md)
 - [Searching For Hex Digits](vim/searching-for-hex-digits.md)
 - [Set End Of Line Markers](vim/set-end-of-line-markers.md)

vim/reverse-a-group-of-lines.md

@@ -0,0 +1,20 @@
+# Reverse A Group Of Lines
+
+The following command can be used to reverse the order of all lines in a
+file by doing a global move on all lines that match the beginning of line
+character starting at the theoretically 0th character:
+
+```
+:g/^/m 0
+```
+
+Reversing a range of lines is a little more work. Just as the previous
+example needs to be anchored against the 0th character, a specific range of
+lines needs to be anchored at the line just before the range. Thus reversing
+the lines 5 to 10 requires being anchored at line 4, like so:
+
+```
+:4,10g/^/m 4
+```
+
+[source](http://superuser.com/questions/189947/how-reverse-selected-lines-order-in-vim#)