cpu_usage_per_core.sh - Outputs per-core CPU use percentage, space separated one-liner.

cpu_usage_per_core.sh

#!/bin/bash
# cpu_usage_per_core.sh
# Outputs per-core CPU use percentage, space separated one-liner.
# Created 2020-05-14 - updated 2020-08-13
# Written for Siduction (Debian sid based distro)
# By dpanter https://gist.github.com/dpanter
# requires _mpstat_ (provided by Debian package _sysstat_)

# Failsafe for awk arithmetic ops, if locale uses comma decimal separator
LC_NUMERIC="C"

# Find number of cores on the system
CORES=`grep -c processor /proc/cpuinfo`

# Define number of lines to be trimmed from the bottom of mpstat output
COREHEAD=$(($CORES+3))

# Remove while loop to only run once
while :
do
   # Print date and time, ISO format
   echo -ne `date +"%F %T"`" "

   # Output sums up all columns from mpstat except %idle
   # mpstat requires a 1 second delay to grab current data!!!
   # mpstat -P <cores> <delay> <iterations>
   # sed trims the top 4 rows
   # head trims the bottom rows
   # awk strips the irrelevant columns and sums the rows
   LIST=`mpstat -P ALL 1 1 | sed '1,4d' | head -n -$COREHEAD | awk '{print $3,$4,$5,$6,$7,$8,$9,$10,$11}' | awk '{print $1+$2+$3+$4+$5+$6+$7+$8+$9}'`

   # Output to single line with a single space as delimiter
   echo -ne $LIST '\n'
done