You can write a bash script to delete the oldest files and sub-directories within a specified directory. The script should start with the oldest file and continue until the chosen directory is less than 10 GB. Here's an example script to do this:

#!/bin/bash

# Set the directory to search
directory="/path/to/directory/to/search"

# Get the size of the directory
dir_size=$(du -s $directory | cut -f1)

# While the directory is larger than 10 GB
while [ $dir_size -gt 10240 ]
do
  # Find the oldest file or directory in the directory
  oldest_file=$(find $directory -mindepth 1 -printf '%T@ %p\n' | sort -n | head -1 | cut -f2- -d" ")
  
  # Delete the oldest file or directory
  rm -rf $oldest_file
  
  # Get the new size of the directory
  dir_size=$(du -s $directory | cut -f1)
done
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