Bash Script - Need to remove files from a directory till the Directory size is Less than 8 TB

Question

Below is the high level scenario for which I need to create a bash script.

• A directory on the server - /sasdata2/SAS-USERS/PBU/
• The size of the above directory should not be more than 8 TB
• If the size exceeds 8 TB, need to delete the oldest files by 'created/modified' date to get the size back down to 8 TB.
• Several sub-directories in this main directory but nothing should be removed from the sub-directories. Only files in the main directory can be removed.

Below is a script I am using, but it is going in an infinite loop on the while statement. Need your help in making a script for the above scenario.

while [ "$(du -shb /sasdata2/SAS-USERS/PBU | awk '{print $1}')" -gt 900 ]
do
  find /sasdata2/SAS-USERS/PBU -maxdepth 0 -type f -printf '%T@\t%p\n' | \
  sort -n | head -n 25 | cut -d $'\t' -f 2-  | xargs -d '\n' rm -f
done

Answer 1

I think your while condition is wrong. du -b will give you bytes, why comparing to 900?

Beside, Why do you need a loop on du and delete arbitrary 25 files? calculate with du how many bytes you are over 8TB, then ls -ltr and in a loop delete files and sum their size until you reach the over bytes