How to get overall CPU usage e g 57 on Linux

Question

I am wondering how you can get the system CPU usage and present it in percent using bash  for example   Sample output   57    In case there is more than one core  it would be nice if an average percentage could be calculated

User · Answer

Take a look at cat  proc stat  grep  cpu    proc stat   awk   usage   2  4  100   2  4  5   END  print usage        EDIT please read comments before copy-paste this or using this for any serious work  This was not tested nor used  it s an idea  for people who do not want to install a utility or for something that works in any distribution  Some people think you can  apt-get install  anything   NOTE  this is not the current CPU usage  but the overall CPU usage in all the cores since the system bootup  This could be very different from the current CPU usage  To get the current value top  or similar tool  must be used   Current CPU usage can be potentially calculated with    awk   u  2  4  t  2  4  5  if  NR  1  u1 u  t1 t   else print   2  4-u1    100    t-t1             lt  grep  cpu    proc stat   lt  sleep 1 grep  cpu    proc stat

User · Answer

You can try   top -bn1   grep  Cpu s                  sed  s         0-9        id    1                  awk   print 100 -  1

User · Answer

Might as well throw up an actual response with my solution  which was inspired by Peter Liljenberg s     mpstat   awk   12     0-9       print 100 -  12       0 75    This will use awk to print out 100 minus the 12th field  idle   with a percentage sign after it  awk will only do this for a line where the 12th field has numbers and dots only   12     0-9       You can also average five samples  one second apart     mpstat 1 5   awk  END print 100- NF        Test it like this     mpstat 1 5   tee  dev tty   awk  END print 100- NF

User · Answer

Try mpstat from the sysstat package   gt  sudo apt-get install sysstat Linux 3 0 0-13-generic  ws025   02 10 2012   x86 64      2 CPU     03 33 26 PM  CPU     usr    nice     sys  iowait     irq    soft   steal   guest    idle 03 33 26 PM  all    2 39    0 04    0 19    0 34    0 00    0 01    0 00    0 00   97 03   Then some cutor grepto parse the info you need   mpstat   grep -A 5   idle    tail -n 1   awk -F       print 100 -    12  a

User · Answer

EDITED  I noticed that in another user s reply  idle was field 12 instead of field 11  The awk has been updated to account for the  idle field being variable   This should get you the desired output   mpstat   awk   3    CPU    for i 1 i lt  NF i      if   i     idle   field i      3    all    print 100 -  field      If you want a simple integer rounding  you can use printf   mpstat   awk   3    CPU    for i 1 i lt  NF i      if   i     idle   field i      3    all    printf   d    100 -  field

[linux] How to get overall CPU usage (e.g. 57%) on Linux

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