Delete files in folder matching name sess_* older than 7 days:¶

find /srv/sitedata/wordpress/oompher/phpsessions/ -type f -mtime +7 -name 'sess_*' -execdir rm -- {} \;

Delete files modified more than 5 days ago¶

find /path/to/files/ -mtime +5 -exec rm {} \;

Move files smaller than X size¶

find . -type f -maxdepth 1 -size -50k -exec mv {} temp/ \;