How to improve your Command Line Skills and be more productive

There were also many great threads on HN about UNIX commands:

  Unix Commands I Wish I'd Discovered Years Earlier [1]
  Useful Unix commands for data science [2]
  Favorite Unix Commands [3]
  Top Unix Command Line Utilities [4]

[1] https://news.ycombinator.com/item?id=6360320

[2] https://news.ycombinator.com/item?id=6046682

[3] https://news.ycombinator.com/item?id=5022457

[4] https://news.ycombinator.com/item?id=4985393