One can see a list of top process that using the most memory or CPU or disk. The top command is another highly recommended method to see your Unix servers resource usage.
The -l option passed to the pgrep command to display long format and process name too. Many variants of Unix comes with the pgrep command to search/find process. Sudo ps -aux | egrep 'sshd|openvpn' pgrep command You can search for a particular Unix process using grep command/ egrep command: Hence, it uses the following less command/ more command as pipe to display process one screen at a time: The process ID (PID) is essential to kill or control process on Unix. The following command shows all processes running on your system: The ps command is a traditional Unix command to lists running processes.
Alternatively, you can issue the top command to view running process in Unix How to manage processes from the Unix terminal. Type the ps aux command to see all running process in Unix. For remote Unix server use the ssh command for log in purpose. The easiest way to do that is to terminate the parent process using the kill command.The procedure to monitor the running process in Unix using the command line is as follows: Because you do not want too many zombie processes existing in the system, you will need to remove the one that you have created. Perhaps the easiest way to determine that the child process is indeed a zombie is to run the program that you have written in the background (using the &) and then run the command ps -1 to determine whether the child is a zombie process. The process identifier (pid) of the child process is listed in the PID column, and that of the parent is listed in the PPID column. The process states are shown below the S column processes with a state of Z are zombies. Process states can be obtained from the command. This zombie process must remain in the system for at least 10 seconds. 
Using either a UNIX or a Linux system, write a C program that forks a child process that ultimately becomes a zombie process.
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