Merge 295fe153ad into 5ebdd9a1a9

Hello, I've added a small blockquote below the description to indicate that this method of accessing an indefinite number of function arguments has been superseded by the use of the spread operator via rest parameters for ES6+ compatibility.

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).
 
-_1470 TILs and counting..._
+_1471 TILs and counting..._
 
 ---
 
@@ -1386,6 +1386,7 @@ _1470 TILs and counting..._
 - [Command Line Length Limitations](unix/command-line-length-limitations.md)
 - [Compare Two Variables In A Bash Script](unix/compare-two-variables-in-a-bash-script.md)
 - [Configure cd To Behave Like pushd In Zsh](unix/configure-cd-to-behave-like-pushd-in-zsh.md)
+- [Convert JPEG To PNG With ffmpeg](unix/convert-jpeg-to-png-with-ffmpeg.md)
 - [Convert SVG To Favicon](unix/convert-svg-to-favicon.md)
 - [Copying File Contents To System Paste Buffer](unix/copying-file-contents-to-system-paste-buffer.md)
 - [Copying Nested Directories With Ditto](unix/copying-nested-directories-with-ditto.md)

javascript/accessing-arguments-to-a-function.md

@@ -5,6 +5,8 @@ an array-like object with all of the arguments to the function. Even if not
 all of the arguments are referenced in the function signature, they can
 still be accessed via the `arguments` object.
 
+> For ES6+ compatibility, the `spread` operator used via [rest parameters](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/rest_parameters) is preferred over the `arugments` object when accessing an abritrary number of function arguments.
+
 ```javascript
 function argTest(one) {
   console.log(one);

unix/convert-jpeg-to-png-with-ffmpeg.md

@@ -0,0 +1,20 @@
+# Convert JPEG To PNG With ffmpeg
+
+The `ffmpeg` utility "is a universal media converter." That means we can use it
+to convert, for instance, a JPEG file to a PNG file.
+
+There is not a lot to a conversion like this. We use `-i` to specify the
+existing input file (a JPEG) and then the other argument is the name and
+extension of the output file.
+
+```bash
+$ ls
+profile.jpg
+
+$ ffmpeg -i profile.jpg profile.png
+
+$ ls
+profile.jpg  profile.png
+```
+
+See `man ffmpeg` for more details.