I want to display Memory usage, Disk Usage and CPU Load in the following format:

Memory Usage: 33/512MB (6%)    
Disk usage: 4.2/20GB (23%) 
CPU Load: 0.01

How do I do that?

  • Looks a lot like homework. Grab the data you need from /proc itself or from other commands then format it with awk, perl, or just bash. Mar 11, 2014 at 13:25
  • Welcome to Unix & Linux Stack Exchange! Please always include your OS. Solutions very often depend on the Operating System being used. Are you using Unix, Linux, BSD, OSX, something else? Which version?
    – terdon
    Mar 11, 2014 at 16:26
  • Thanks guys for your help. However, I got my answer here stackoverflow.com/questions/33774260/… Nov 18, 2015 at 8:55

7 Answers 7


Try this, it works on my Debian system. The details may vary depending on the implementation of these tools that your OS uses:

free -m | awk 'NR==2{printf "Memory Usage: %s/%sMB (%.2f%%)\n", $3,$2,$3*100/$2 }'
df -h | awk '$NF=="/"{printf "Disk Usage: %d/%dGB (%s)\n", $3,$2,$5}'
top -bn1 | grep load | awk '{printf "CPU Load: %.2f\n", $(NF-2)}' 

If you save the above as a script and run it, you will get (example from my system):

$ ./foo.sh 
Memory Usage: 4986/7994MB (62.37%)
Disk Usage: 23/68GB (35%)
CPU Load: 0.78

Note that the script above is giving the disk usage for the / partition. You did not specify what you wanted so I'm guessing that's what you're after.

  • 1
    I tried with only awk github.com/rahulinux/scripts/blob/master/sys_info.sh Mar 11, 2014 at 17:31
  • 3
    because it's just your copied ans. :D Mar 12, 2014 at 4:42
  • 1
    the free -m line does give me a error, the percentage was not properly escaped. this is how it should be: free -m | awk 'NR==2{printf "Memory Usage: %s/%sMB (%.2f%%)\n", $3,$2,$3*100/$2 }'
    – simon
    Dec 10, 2015 at 21:17
  • 1
    @user1735921 Please ask a question. But first, google how to store the output of a command in a variable, that is trivial. Then, explain what you want to store and what you want to test in the question.
    – terdon
    Mar 16, 2017 at 13:09
  • 1
    @Maveňツ neither, that's not how CPU load works. See scoutapm.com/blog/understanding-load-averages.
    – terdon
    Oct 1, 2021 at 7:51

Check atop.

Read this, https://lwn.net/Articles/387202/

See, enter image description here

You can see load of disk / memory / cpu by apps:

enter image description here

For example, disk usage:

enter image description here

atop gathered statistics in the directory /var/log/atop/ in binary format files per days. You could read a man page, there must be a way to extract useful information.


There's not a command to display exactly in your particular format, but the following provide some of the base values, which one could build a script around, as an alternative it's also possible to read values from /proc and /sys.

free - quick overview

vmstat 1 shows system performance i/o stats

top dynamic

htop similar to top

  • 1
    Throw in my personal favourite, iostat. Mar 11, 2014 at 13:24

I think you need nagios help, for all this plugins/srcipts for nagios are already made and you can download and test without nagios installation.


If you are using solaris, check this out: showcpucount

This will give you an idea of how to go about writing your code.

  • Blog no longer exists.
    – Jay Elston
    Feb 25, 2019 at 14:39

Here is my code for getting CPU and RAM usage:

### 1. get total average CPU usage for the past minute
# a. split response
IFS=',' read -ra avg_cpu_use_arr <<< "$avg_cpu_use"
# b. find cpu usage
for i in "${avg_cpu_use_arr[@]}"; do :
    if [[ $i == *"load average"* ]]; then
# c. create response
avg_cpu_use=$(echo ${avg_cpu_use:16})   # Remove "  load average: "
if [[ -z "${avg_cpu_use// }" ]]; then
    avg_cpu_use="CPU: N/A%%"
    exit -1
    avg_cpu_use="CPU: ${avg_cpu_use}%%"

### 2. get RAM usage
ram_use=$(free -m)
# a. split response by new lines
IFS=$'\n' read -rd '' -a ram_use_arr <<< "$ram_use"
# b. remove extra spaces
ram_use=$(echo "$ram_use" | tr -s " ")
# c. split response by spaces
IFS=' ' read -ra ram_use_arr <<< "$ram_use"
# d. get variables
# e. create response
ram_use="RAM: ${ram_use}/${total_ram} MB"

echo $avg_cpu_use
echo $ram_use

You should be able to display Memory usage, Disk Usage and CPU Load using:

(ps hax -o rss,user | awk '{a[$2]+=$1;}END{for(i in a)print i" "int(a[i]/1024+0.5);}' | sort -rnk2)

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