#A simplistic approach would be
du -shc /home/*
du -shc /home/jnarayan
#To sort it:
du -smc /home/* | sort -n
#There is also a wellknown Perl script that has the option of mailing disk usage reports per user: durep
http://www.ubuntugeek.com/create-disk-usage-reports-with-durep.html
