Collect or create content and exercises about shell pipelines

[illicitonion]

https://sdc.codeyourfuture.io/computers/sprints/2/success/

We want our trainees to be comfortable writing simple pipelines of shell tools.

LOs:

• Count the occurrences of different lines within a file using sort and uniq
• List the files in a directory which contain an upper-case letter in their name with ls and grep
• Count the number of files in a directory which contain an upper-case letter in their name with ls, grep, and wc
• Pipe the output of jq to something interesting