Question

Unix Help - I cant figure out how to answer the last question. Please help!

Write a bash script to produce the answers to each of the questions below. Before the output, echo to the screen the question number and the command that will be executed.

Show a real-time view of system information, such as CPU usage, memory usage, etc., and the processes using the most CPU, memory and time.

Answer 1

for the question you posted you are only asking for the last question that is how to show the real time view of system information,etc. so i will try to answer only that with all my knowledge.

As a Linux user, you may need to need to know some basic details of your Linux system, like currently running processes, average system load, cpu and memory usage etc., at some point. for this , we have a command line utility called “top” to get such details.

The top command is a well-known and most widely used utility to display dynamic real-time information about running processes in Unix-like operating systems. In this brief tutorial, we are going to see some Top command examples on Linux.

To start monitoring the running processes, simply run the top command without any options:

$ top

now you will see some output in the form of tables and attributes.

the top command displays the list of processes in multiple columns. each column displays details such as pid, user, cpu usage, memory usage. Apart from the list of processes, you will also see the brief stats about average system load, number of tasks, cpu usage, memory usage and swap usage on the top.

I will explain the attributes which will come up when you will execute the top command.

• PID – Process id of the task.
• USER – Username of the the task’s owner.
• PR – Priority of the task.
• NI – Nice value of the task. If the nice value is negative, the process gets higher priority. If the nice value is positive, the priority is low. Refer this guide to know more about nice.
• VIRT – Total amount of virtual memory used by the task.
• RES – Resident Memory Size, the non-swapped physical memory a task is currently using.
• SHR – Shared Memory Size. The amount of shared memory used by a task.
• S – The status of the process (S=sleep R=running Z=zombie).
• %CPU – CPU usage. The task’s share of the elapsed CPU time since the last screen update, expressed as a percentage of total CPU time.
• %MEM – Memory Usage. A task’s currently resident share of available physical memory.
• TIME+ – Total CPU time used by the task since it has started, precise to the hundredths of a second.
• COMMAND – Name of the running program.

Hope you got clear !

Thank you !