I have directory where new sub directories and files being created every few minutes. The directories are like abc_date, def_date, ghi_date. I am looking to keep the latest 2 unique directories and delete everything else.
Here is what I have so far

This gives me unique names excluding the date.
ls -lt | awk '{ print $9 }' | cut -d_ -f1 | sort | uniq


This will give me the files that I want to delete for the uniq word abc
ls -lt |grep abc | sort -r | tail +3

My question is, how do i pass the output of first command to the second one and delete what is needed? Any help is greatly appreciated.