Finding the Percentage from a grep variable












0














I want to display the calculation of the CPU load in percentage.



num2=$(uptime | grep "average:" | tr -d " " | cut -d ':' -f 5 | cut -d ',' -f 2)



percent=$((num2(*100)))

echo 'CPU percentage' $percent


Am I missing something?






shell-script variable uptime







share|improve this question
























  • Is that an actual typo of (*100) or a copy/paste typo?
    – Jeff Schaller
    Dec 28 '18 at 19:03










  • Nope that's what I think how it should be.
    – User101
    Dec 28 '18 at 19:08






  • 1




    bash arithmetic uses infix notation, so you'd need $((num2 * 100)), if that's all that's stopping you
    – Jeff Schaller
    Dec 28 '18 at 19:10










  • it always shows up a syntax error: invalid arithmetic operator (error token is ".01")
    – User101
    Dec 28 '18 at 19:25










  • That seems like an awfully long pipeline - at least on Linux, you might want to look at reading the value more directly from /proc/loadavg e.g. awk '{print "CPU percentage " $2*100}' < /proc/loadavg
    – steeldriver
    Dec 28 '18 at 19:26
















0














I want to display the calculation of the CPU load in percentage.



num2=$(uptime | grep "average:" | tr -d " " | cut -d ':' -f 5 | cut -d ',' -f 2)



percent=$((num2(*100)))

echo 'CPU percentage' $percent


Am I missing something?






shell-script variable uptime







share|improve this question
























  • Is that an actual typo of (*100) or a copy/paste typo?
    – Jeff Schaller
    Dec 28 '18 at 19:03










  • Nope that's what I think how it should be.
    – User101
    Dec 28 '18 at 19:08






  • 1




    bash arithmetic uses infix notation, so you'd need $((num2 * 100)), if that's all that's stopping you
    – Jeff Schaller
    Dec 28 '18 at 19:10










  • it always shows up a syntax error: invalid arithmetic operator (error token is ".01")
    – User101
    Dec 28 '18 at 19:25










  • That seems like an awfully long pipeline - at least on Linux, you might want to look at reading the value more directly from /proc/loadavg e.g. awk '{print "CPU percentage " $2*100}' < /proc/loadavg
    – steeldriver
    Dec 28 '18 at 19:26














0












0








0







I want to display the calculation of the CPU load in percentage.



num2=$(uptime | grep "average:" | tr -d " " | cut -d ':' -f 5 | cut -d ',' -f 2)



percent=$((num2(*100)))

echo 'CPU percentage' $percent


Am I missing something?






shell-script variable uptime







share|improve this question















I want to display the calculation of the CPU load in percentage.



num2=$(uptime | grep "average:" | tr -d " " | cut -d ':' -f 5 | cut -d ',' -f 2)



percent=$((num2(*100)))

echo 'CPU percentage' $percent


Am I missing something?






shell-script variable uptime




shell-script variable uptime






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Dec 28 '18 at 19:03









Jeff Schaller

39k1054125




39k1054125










asked Dec 28 '18 at 19:01









User101User101

584




584












  • Is that an actual typo of (*100) or a copy/paste typo?
    – Jeff Schaller
    Dec 28 '18 at 19:03










  • Nope that's what I think how it should be.
    – User101
    Dec 28 '18 at 19:08






  • 1




    bash arithmetic uses infix notation, so you'd need $((num2 * 100)), if that's all that's stopping you
    – Jeff Schaller
    Dec 28 '18 at 19:10










  • it always shows up a syntax error: invalid arithmetic operator (error token is ".01")
    – User101
    Dec 28 '18 at 19:25










  • That seems like an awfully long pipeline - at least on Linux, you might want to look at reading the value more directly from /proc/loadavg e.g. awk '{print "CPU percentage " $2*100}' < /proc/loadavg
    – steeldriver
    Dec 28 '18 at 19:26


















  • Is that an actual typo of (*100) or a copy/paste typo?
    – Jeff Schaller
    Dec 28 '18 at 19:03










  • Nope that's what I think how it should be.
    – User101
    Dec 28 '18 at 19:08






  • 1




    bash arithmetic uses infix notation, so you'd need $((num2 * 100)), if that's all that's stopping you
    – Jeff Schaller
    Dec 28 '18 at 19:10










  • it always shows up a syntax error: invalid arithmetic operator (error token is ".01")
    – User101
    Dec 28 '18 at 19:25










  • That seems like an awfully long pipeline - at least on Linux, you might want to look at reading the value more directly from /proc/loadavg e.g. awk '{print "CPU percentage " $2*100}' < /proc/loadavg
    – steeldriver
    Dec 28 '18 at 19:26
















Is that an actual typo of (*100) or a copy/paste typo?
– Jeff Schaller
Dec 28 '18 at 19:03




Is that an actual typo of (*100) or a copy/paste typo?
– Jeff Schaller
Dec 28 '18 at 19:03












Nope that's what I think how it should be.
– User101
Dec 28 '18 at 19:08




Nope that's what I think how it should be.
– User101
Dec 28 '18 at 19:08




1




1




bash arithmetic uses infix notation, so you'd need $((num2 * 100)), if that's all that's stopping you
– Jeff Schaller
Dec 28 '18 at 19:10




bash arithmetic uses infix notation, so you'd need $((num2 * 100)), if that's all that's stopping you
– Jeff Schaller
Dec 28 '18 at 19:10












it always shows up a syntax error: invalid arithmetic operator (error token is ".01")
– User101
Dec 28 '18 at 19:25




it always shows up a syntax error: invalid arithmetic operator (error token is ".01")
– User101
Dec 28 '18 at 19:25












That seems like an awfully long pipeline - at least on Linux, you might want to look at reading the value more directly from /proc/loadavg e.g. awk '{print "CPU percentage " $2*100}' < /proc/loadavg
– steeldriver
Dec 28 '18 at 19:26




That seems like an awfully long pipeline - at least on Linux, you might want to look at reading the value more directly from /proc/loadavg e.g. awk '{print "CPU percentage " $2*100}' < /proc/loadavg
– steeldriver
Dec 28 '18 at 19:26










2 Answers
2






active

oldest

votes


















0














You can pipe your calculation for percent into bc.



percent=$(echo "scale=0;$num2*100" | bc)


It'll give you a number like "41.00" you can cut that off the end with



percent=${percent%.*}





share|improve this answer





























    0














    Your num2 value will be something like 0.41. bash can do integer calculations only, no floating. That's why we get an eror msg like 



    bash: 0.41 * 100 : syntax error: invalid arithmetic operator (error token is ".41 * 100 ")


    Try removing the dots when using your tr -d statement. That would be equivalent to a multiplication by 100.






    share|improve this answer























    • This should be a comment. An answer should explain how to solve the problem, not just the reason for the error.
      – Barmar
      Dec 28 '18 at 23:46










    • Thanks, @Barmar. Added a proposal to circumnavigate the error.
      – RudiC
      Dec 29 '18 at 8:44










    • What dots in the tr -d command? Show the command he should be writing instead.
      – Barmar
      Dec 30 '18 at 4:37











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    2 Answers
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    active

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    2 Answers
    2






    active

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    active

    oldest

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    0














    You can pipe your calculation for percent into bc.



    percent=$(echo "scale=0;$num2*100" | bc)


    It'll give you a number like "41.00" you can cut that off the end with



    percent=${percent%.*}





    share|improve this answer


























      0














      You can pipe your calculation for percent into bc.



      percent=$(echo "scale=0;$num2*100" | bc)


      It'll give you a number like "41.00" you can cut that off the end with



      percent=${percent%.*}





      share|improve this answer
























        0












        0








        0






        You can pipe your calculation for percent into bc.



        percent=$(echo "scale=0;$num2*100" | bc)


        It'll give you a number like "41.00" you can cut that off the end with



        percent=${percent%.*}





        share|improve this answer












        You can pipe your calculation for percent into bc.



        percent=$(echo "scale=0;$num2*100" | bc)


        It'll give you a number like "41.00" you can cut that off the end with



        percent=${percent%.*}






        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Dec 28 '18 at 23:06









        user208145user208145

        1,27121215




        1,27121215

























            0














            Your num2 value will be something like 0.41. bash can do integer calculations only, no floating. That's why we get an eror msg like 



            bash: 0.41 * 100 : syntax error: invalid arithmetic operator (error token is ".41 * 100 ")


            Try removing the dots when using your tr -d statement. That would be equivalent to a multiplication by 100.






            share|improve this answer























            • This should be a comment. An answer should explain how to solve the problem, not just the reason for the error.
              – Barmar
              Dec 28 '18 at 23:46










            • Thanks, @Barmar. Added a proposal to circumnavigate the error.
              – RudiC
              Dec 29 '18 at 8:44










            • What dots in the tr -d command? Show the command he should be writing instead.
              – Barmar
              Dec 30 '18 at 4:37
















            0














            Your num2 value will be something like 0.41. bash can do integer calculations only, no floating. That's why we get an eror msg like 



            bash: 0.41 * 100 : syntax error: invalid arithmetic operator (error token is ".41 * 100 ")


            Try removing the dots when using your tr -d statement. That would be equivalent to a multiplication by 100.






            share|improve this answer























            • This should be a comment. An answer should explain how to solve the problem, not just the reason for the error.
              – Barmar
              Dec 28 '18 at 23:46










            • Thanks, @Barmar. Added a proposal to circumnavigate the error.
              – RudiC
              Dec 29 '18 at 8:44










            • What dots in the tr -d command? Show the command he should be writing instead.
              – Barmar
              Dec 30 '18 at 4:37














            0












            0








            0






            Your num2 value will be something like 0.41. bash can do integer calculations only, no floating. That's why we get an eror msg like 



            bash: 0.41 * 100 : syntax error: invalid arithmetic operator (error token is ".41 * 100 ")


            Try removing the dots when using your tr -d statement. That would be equivalent to a multiplication by 100.






            share|improve this answer














            Your num2 value will be something like 0.41. bash can do integer calculations only, no floating. That's why we get an eror msg like 



            bash: 0.41 * 100 : syntax error: invalid arithmetic operator (error token is ".41 * 100 ")


            Try removing the dots when using your tr -d statement. That would be equivalent to a multiplication by 100.







            share|improve this answer














            share|improve this answer



            share|improve this answer








            edited Dec 29 '18 at 8:44

























            answered Dec 28 '18 at 21:42









            RudiCRudiC

            4,2191312




            4,2191312












            • This should be a comment. An answer should explain how to solve the problem, not just the reason for the error.
              – Barmar
              Dec 28 '18 at 23:46










            • Thanks, @Barmar. Added a proposal to circumnavigate the error.
              – RudiC
              Dec 29 '18 at 8:44










            • What dots in the tr -d command? Show the command he should be writing instead.
              – Barmar
              Dec 30 '18 at 4:37


















            • This should be a comment. An answer should explain how to solve the problem, not just the reason for the error.
              – Barmar
              Dec 28 '18 at 23:46










            • Thanks, @Barmar. Added a proposal to circumnavigate the error.
              – RudiC
              Dec 29 '18 at 8:44










            • What dots in the tr -d command? Show the command he should be writing instead.
              – Barmar
              Dec 30 '18 at 4:37
















            This should be a comment. An answer should explain how to solve the problem, not just the reason for the error.
            – Barmar
            Dec 28 '18 at 23:46




            This should be a comment. An answer should explain how to solve the problem, not just the reason for the error.
            – Barmar
            Dec 28 '18 at 23:46












            Thanks, @Barmar. Added a proposal to circumnavigate the error.
            – RudiC
            Dec 29 '18 at 8:44




            Thanks, @Barmar. Added a proposal to circumnavigate the error.
            – RudiC
            Dec 29 '18 at 8:44












            What dots in the tr -d command? Show the command he should be writing instead.
            – Barmar
            Dec 30 '18 at 4:37




            What dots in the tr -d command? Show the command he should be writing instead.
            – Barmar
            Dec 30 '18 at 4:37


















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