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Top is a great command that displays the real time status of system resources like CPU, memory, processes, swap memory, etc.
Top is one of the most using system monitoring command in unix like systems. The out put data can be sort by CPU usage, memory usage, process, etc.
Sample output of "top" command
[root@server ~#]top
top - 19:36:00 up 10:07, 1 user, load average: 0.00, 0.00, 0.00
Tasks: 167 total, 1 running, 166 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.3%us, 0.7%sy, 0.0%ni, 99.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 1003620k total, 727860k used, 275760k free, 68096k buffers
Swap: 3071992k total, 0k used, 3071992k free, 293536k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
15021 root 20 0 15016 1216 896 R 0.7 0.1 0:00.18 top
2079 root 20 0 113m 14m 5204 S 0.3 1.5 0:05.92 Xorg
1 root 20 0 19316 1404 1136 S 0.0 0.1 0:00.63 init
2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd
3 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/0
4 root 20 0 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/0
5 root RT 0 0 0 0 S 0.0 0.0 0:00.00 watchdog/0
6 root 20 0 0 0 0 S 0.0 0.0 0:00.01 events/0
7 root 20 0 0 0 0 S 0.0 0.0 0:00.00 cpuset
8 root 20 0 0 0 0 S 0.0 0.0 0:00.00 khelper
9 root 20 0 0 0 0 S 0.0 0.0 0:00.00 netns
10 root 20 0 0 0 0 S 0.0 0.0 0:00.00 async/mgr
11 root 20 0 0 0 0 S 0.0 0.0 0:00.00 pm
Monitor one or more process only
[root@server ~#]top -p 547 (Here 547 is process id )
[root@server ~#]top -p 125,554 (Monitor two process at once )
short cuts keys while running top command
q - Quit from topd - change refresh interval
s - change refresh interval
k - Kill a process by its pid
u - Filter by user
o - Add or remove columns
f - Add or remove columns
l - Display/Hide load average
t - Display/Hide tasks
m - Display/Hide memory status
LABELS: 
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