$ docker ps | rb drop 1 | rb -l split[1]
  $ docker ps | perl -anE 'say $F[1] if $.>1'

perl solved this problem a long time ago, people

for your given sample, you could use awk[0] as well

    awk 'NR>1{print $2}'

or ruby[1]

    ruby -ane 'puts $F[1] if $.>1'

which one to use depends on lots of factor - speed, features, availability, etc as well as whether user already knows perl[2]/ruby/etc

Further reading(disclosure: I wrote these)

[0]: https://github.com/learnbyexample/Command-line-text-processi...

[1]: https://github.com/learnbyexample/Command-line-text-processi...

[2]: https://github.com/learnbyexample/Command-line-text-processi...