I was messing with this at... Some point in the last few years.

A example of manipulating header self-links and a table of contents.

This is mostly useless, but I didn't want to forget how I did it.

I worked this out the other night before doing something similar for a
log monitoring utility we use at WMF.

It could use some improvements, and ideally it'd be a general-purpose
utility, but might as well capture this version here.

Just a bit of stuff on usage of Time::Piece.

For earthtopus, who asks:

> say I have a big text file and I want to find the line(s) with the most
> instances of a substring on it.  Say the most instances of the letter R.
>
> What's a good (and by good I mean lazy) way to do that?

There's probably a switch to grep or something for this, but whatever.

(Also IIRC this dir shouldn't be called xargs-alias.  Whatever.)

argv.pl: Print out the arguments to a script.

bad-regex.pl: What happens when you compile a broken regex?

See this thread:

  https://mspsocial.net/@earthtopus/103292407770594677

As best I remember, this proceeded from some IRC conversation.

Demonstrate a couple of gotchas with `empty()` in PHP.