Add exercise for reading and writing files

        this.verify('if ( ! [ -d /resources/stuff/to ] && [ -f /resources/stuff/b_file.png ] ); then echo "yes"; else echo "no"; fi').hasOutput("yes")

    })

    this.exercise("Textdateien lesen und schreiben", async function () {

        this.describe(`Lasse dir den Inhalt der Datei "reverse.txt" anzeigen und schreibe den Inhalt 

        in umgekehrter Reihenfolge in eine neue Datei mit dem Namen "correct.txt"`)

        await this.prepareWith("echo 'ILOC' >> reverse.txt")

        await this.manualConfirmation()

        this.verify("cat correct.txt").hasOutput("COLI")

    })

    // To add another exercise, simply copy and paste an exercise(...) block from above and adjust it.

    // Order is respected, so you can e.g. order the exercises by increasing difficulty.

})