List user processes with their memory usage and total usage.

ps -u marcanuy -o pid,rss,command | awk '{print $0}{sum+=$2} END {print "Total", sum/1024, "MB"}'
Add up the amount of memory your processes are using and display the total. Replace marcanuy with your desired username.
Sample Output
 194491  1756 sshd: marcanuy@pts/0
 194501  2056 -bash
 200189  1132 ps -u marcanuy -o pid,rss,command
 200190   960 awk {print $0}{sum+=$2} END {print "Total", sum/1024, "MB"}
 221029  7916 php54 /home/marcanuy/devs/tweets.php
 221030  7632 php54 /home/marcanuy/devs/parser.php
Total 20.9492 MB

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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