Shell Programming and Scripting

find . -user user -type f exec df -h {} \;|awk '{ s = s+$1 } END { print "Total used: ",s }'

find /home -exec ls -ls {} + | awk '{sum[$4]+=$1} END {for (u in sum) print u, sum[u]}'
 0
user1 2753844
sys 2888
root 16872

find /home -exec ls -ls {} + | awk '{sum[$4]+=$1} END {for (u in sum) print u, sum[u]}'
 0
ra60 385344

ls -ls |awk '{s=s+$1} END { print "Total used: ",s }'
Total used:  192392

$ for u in $(ls /home/); do printf "%s\n" "$(du -sh /home/$u)"; done | sort >> outfile && head -n 5 outfile
------------
256M    /home/brutus/
176M    /home/userA/
126M    /home/izzy/
36M     /home/linus/
31M     /home/maud/

find /home -type d -exec ls -ls {} + | awk '{sum[$4]+=$1} END {for (u in sum) print u, sum[u]}'