How to create a random String with Bash

With this approach you can create nearly every random text or number.

tr -dc '0-9A-Za-z' < /dev/random | head -c10

Explanation:

tr -dc deletes all characters except those specified in the argument. This means that we waste a lot of bytes, but for occasional manual use, this is usually acceptable.
| head -c10 prints the first 10 characters of the output of the previous command.