Here’s how to isolate a process via the top command.
top -c -p $(pgrep -f process_name | head -20 | tr "\\n" "," | sed 's/,$//') |
top
Nmap Scan Top 1000 Ports
Use this option if you want to scan the top 1000 ports.
$ nmap -F 10.10.10.10 |
If you want a single specific port, then use -p option.
$ nmap -p 80 10.10.10.10 |
Top Shift i
When you run top on Linux with multiple processors, you can have processes with percentages higher than 100%. On a 4 core system, you can have a process that can run as high as 400%. To view it differently, press “shift i” while top is running. This will toggle the Irix mode to off. Pressing it again will turn it on. When the Irix mode is off, it will only show percentages divided by a total number of CPUs. This way, you get a true percentage of a process in a multiple core system.
Pressing 1 interestingly shows the breakdown of all CPUs.
iotop
iotop is a Linux command similar to top but instead of CPU and memory it will display and monitor your disk IO usage.
To install, run the following command based on your Linux ditro.
yum install iotop apt install iotop dnf install iotop |
To use.
iotop
iotop -o |
Output:
