====== Find large files (higher than 100 mb) ======

  find . -type f -size +100M
  
./13/data/log/postgresql-Tue.log

Then check it's size:

    ls -lh ./13/data/log/postgresql-Tue.log

-rw------- 1 postgres postgres 1.3G Jan 31 19:10 ./13/data/log/postgresql-Tue.log