Delete all files older than X days

find /path/to/base/dir -type d -ctime +10 -exec rm -fr {} \;

What it all does:

• find: the unix command for finding files /directories / links etc.
• /path/to/base/dir: the directory to start your search
• type d: only find directories
• ctime +10: only consider the ones with modification time older than 10 days
• exec … ;: for each such result found, do the following command in …
• rm -fr {}: recursively force remove the directory; the {} part is where the find result gets substituted into from the previous part.

List space in each partition

df -h 

List by sort order with newest on the bottom

ls -ntr

Find largest 10 files/directories

du -hsx /PATH/TO/DIR | sort -rh | head -10