# cd /etc && ls -l passwd
-rw-r--r-- 1 root root 1237 2007-11-24 19:59 passwd

# cd /usr/bin && ls -l passwd
-rwsr-xr-x 1 root root 29060 2006-10-20 02:52 passwd

# ps aux | head -n 5
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root         1  0.3  0.0   1628   536 ?        Ss   11:54   0:01 /sbin/init splash
root         2  0.0  0.0      0     0 ?        S    11:54   0:00 [migration/0]
root         3  0.0  0.0      0     0 ?        SN   11:54   0:00 [ksoftirqd/0]
root         4  0.0  0.0      0     0 ?        S    11:54   0:00 [watchdog/0]

#ps -l
F S   UID   PID  PPID  C PRI  NI ADDR SZ WCHAN  TTY          TIME CMD
0 S     0  5095  5092  0  75   0 -   997 wait   pts/0    00:00:00 bash
0 R     0  5164  5095  0  76   0 -   566 -      pts/0    00:00:00 ps

#ps -l -p 1
F S   UID   PID  PPID  C PRI  NI ADDR SZ WCHAN  TTY          TIME CMD
4 S     0     1     0  0  76   0 -   407 -      ?        00:00:01 init

# ps aux --sort -pcpu | head -n 3
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root      4997  5.5  3.8 127632 40044 ?        SLl  11:56   0:16 amarok                   
root      5304  3.9  0.0   1852   776 ?        RN   12:00   0:01 /usr/bin/updatedb

# ps aux --sort -pmem | head -n 3
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root         1  0.2  0.0   1628   536 ?        Ss   11:54   0:01 /sbin/init splash
root         2  0.0  0.0      0     0 ?        S    11:54   0:00 [migration/0]