Deleted the N oldest directories in the current directory

delete_oldest_dirs.sh

#!/usr/bin/env bash
# find . -maxdepth 1 -type d -printf '%T@ %p\0'
#   -- For every directory in the current directory, print a numeric timestamp, a space, the filename, and a null
#
# sort -z -n
#   -- Split the output on nulls (-z) and sort numerically (-n)
#
# gawk 'BEGIN {RS="\0";ORS="\0";FS=" "} NR<=3 {print $2}' | \
#   -- Print first (ie, oldest) three filenames in the list, separated by nulls.
#
# xargs -0 rm -rf 
#   -- for each filename separated by a null (-0), execute 'rm -rf'
#
find . -maxdepth 1 -type d -printf '%T@ %p\0' | \
  sort -z -n | \
  gawk 'BEGIN {RS="\0";ORS="\0";FS=" "} NR<=3 {print $2}' | \
  xargs -0 rm -rf