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Memory in ps u

USER      PID %CPU %MEM    VSZ RSS TTY STAT START TIME COMMAND
root        1  0.0  0.0   3080 1912 ?    Ss  8:25 0:00 /sbin/init
root        2  0.0  0.0      0    0 ?    S<  8:25 0:00 [kthreadd]
root        3  0.0  0.0      0    0 ?    S<  8:25 0:00 [migration/0]
root        4  0.0  0.0      0    0 ?    S<  8:25 0:00 [ksoftirqd/0]
root        5  0.0  0.0      0    0 ?    S<  8:25 0:00 [watchdog/0]
root     1355  0.0  0.0   2220  548 ?    S<s 8:25 0:00 /sbin/udevd --d
root     3237  0.0  0.0   2200 1076 ?    Ss  8:25 0:00 /usr/sbin/acpid
103      3324  0.0  0.0   2800 1108 ?    Ss  8:25 0:00 /bin/dbus-daemo
105      3476  0.0  0.2   6656 4460 ?    Ss  8:25 0:01 /usr/sbin/hald
www-data 3850  0.0  0.1  21372 3372 ?    S   8:25 0:00 /usr/sbin/apach
www-data 3851  0.0  0.1  21372 3372 ?    S   8:25 0:00 /usr/sbin/apach
www-data 3853  0.0  0.1  21372 3372 ?    S   8:25 0:00 /usr/sbin/apach
www-data 3855  0.0  0.1  21372 3372 ?    S   8:25 0:00 /usr/sbin/apach
akkana   3936  0.0  0.0   3504 1548 tty1 S+  8:25 0:00 /bin/bash /usr/
akkana   3979  0.0  0.0   2904  820 tty1 S+  8:25 0:00 xinit /home/akk
akkana   4068  0.0  0.0   1868  508 tty1 S   8:25 0:00 sh /home/akkana
akkana   4105  0.0  0.0   3140  720 tty1 S   8:26 0:00 dbus-launch --a
akkana   8630  0.0  0.0   1868  532 tty1 S   9:51 0:00 /bin/sh /usr/lo
Here's what the basic top output looks like.

But top is a lot more flexible than that.

It's actually a surprisingly useful program.