du --block-size=MiB --max-depth=1 | sort -n
du -h //prints all of the sub directories sizes, the last line "." is the total size du * -h //prints all of the files sizes (in human readable) du -h /directoryname //prints a specific directory's usage
du -ch | grep total //one line with the total size of the directory du -ah | sort -n //sorted numerically
df -h -T //prints the current usage of disks (in human readable)
sudo apt-get install baobab //graphical visualization of file usage boabab //run it from the command line but in the menu it may be "Disk Usage Analyzer"
linux-disk-quotas
http://www.redhat.com/docs/manuals/linux/RHL-8.0-Manual/admin-primer/s1-storage-quotas.html
Using the text editor of your choice, simply add the usrquota and/or grpquota options to the file systems that require quotas:
/dev/md0 / ext3 defaults 1 1 LABEL=/boot /boot ext3 defaults 1 2 none /dev/pts devpts gid=5,mode=620 0 0 LABEL=/home /home ext3 defaults,usrquota,grpquota 1 2 none /proc proc defaults 0 0 none /dev/shm tmpfs defaults 0 0 /dev/md1 swap swap defaults 0 0