find all the files in the folder "/usr/app/etl/01/OTH/log/tra" which have been modified  in the last 240 hours  excluding hidden files and those with the name "/usr/app/etl/01/CLE/par/files_to_skip.par"
find /usr/app/etl/01/OTH/log/tra -type f ! -name ".*" -mtime -10 | egrep -vf /usr/app/etl/01/CLE/par/files_to_skip.par