Check magento session file usage

gistfile1.sh

# Find all the session files older then 3 days then display the number of files.
find /path/to/your/website/root/var/session -name 'sess_*' -type f -mtime +3 | wc -l

# Same as above, but display them in "less", browse with PageUP / PageDown.
find /path/to/your/website/root/var/session -name 'sess_*' -type f -mtime +3 | less

# Delete all the files older then 3 days.
find /path/to/your/website/root/var/session -name 'sess_*' -type f -mtime +3 -exec rm {} \;