Linux/Unix "top" Command

Interactive top command

top -H -p <processid> >> Gives all threads of the process.

shift + M >> Lists processes according to memory usage

shift + C >> Lists processes according to CPU usage

shift + W >> Save top output to a file (/root/.toprc.)

shift + O >> For sorting the process as per requirement

Commands:

c >> shows full path of the process

k >> For killing the process

z >> Listing running process in color

r >> For renice a process

1 >> shows the details of individual CPU's running on the system

d >> change refresh rate

A (caps) >> split top output into multiple screens

a >> to toggle to screens

h >> For help

n >> Reduce the number of listed process to n

Batch mode:

top -b -n 3 > /tmp/topoutput.txt

-b => batchmode

-n => number of iterations in batch mode

-H => Dispaly in threads mode

-o => Sort order on a column + or - prepend.

Some other helpful commands:

htop

iostat -dmx 2 10

dstat -vm

tcpdump -i eth0 -A port 9042