This is a long-term project to decode all of the GNU coreutils in version 8.3.

This resource is for novice programmers exploring the design of command-line utilities. It is best used as an accompaniment providing useful background while reading the source code of the utility you may be interested in. This is not a user guide -- Please see applicable man pages for instructions on using these utilities.

Over the past 25 years, email has weaved itself into the daily fabric of life. Our inboxes contain everything from very personal letters, to work correspondence, to unsolicited inbound sales pitches. In many ways, they are an extension of our homes: private places where we are free to deal with what life throws at us in whatever way we see fit. Have an inbox zero policy? That’s up to you. Let your inbox build into the thousands and only deal with what you can stay on top of? That’s your business too.

It is disappointing then that one of the most hyped new email clients, Superhuman, has decided to embed hidden tracking pixels inside of the emails its customers send out. Superhuman calls this feature “Read Receipts” and turns it on by default for its customers, without the consent of its recipients. You’ve heard the term “Read Receipts” before, so you have most likely been conditioned to believe it’s a simple “Read/Unread” status that people can opt out of. With Superhuman, it is not.

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