CPU利用率統計－shell

 好久沒寫指令碼了，都開始忘記了，今天嘗試著寫了下，好多東西都要現查了，以後會每天寫點，簡單或者難的，有技術的沒技術的，總之，這東西多練習才好。

今天寫的這個指令碼先放這，一點點完善.

 

#!/usr/bin/env bash

PROC_FILE="/proc/stat"

function getline {
  #Original data, it looks like "cpu  391560 66418 112967 3144467 53328 10123 1642 0 0"
  local data=`cat $PROC_FILE | head -n 1`
  CUSER=`echo $data | awk '{print $2}'`
  CNICE=`echo $data | awk '{print $3}'`
  CSYSM=`echo $data | awk '{print $4}'`
  CIDLE=`echo $data | awk '{print $5}'`
  CIOW=`echo $data | awk '{print $6}'`
  CIRQ=`echo $data | awk '{print $7}'`
  CSIRQE=`echo $data | awk '{print $8}'`
  CSTEAL=`echo $data | awk '{print $9}'`
  CGUEST=`echo $data | awk '{print $10}'`

  CSUM=`expr $CUSER + $CNICE + $CSYSM + $CIDLE + $CIOW + $CIRQ + $CSIRQE + $SCTEAL + $CGUEST`
}

function calculate {
  #This is the sleep time between each getline invoke
  local delay=1
  if [ -n "$1" ] ; then
    delay=$1
  fi

  getline

  C_USER=$CUSER
  C_NICE=$CNICE
  C_SYSM=$CSYSM
  C_IDLE=$CIDLE
  C_SUM=$CSUM
 
  sleep $delay
 
  getline

  DIFF=`expr $CSUM - $C_SUM`
  U_USER=`echo "( $CUSER - $C_USER ) / $DIFF * 100" | bc -l | grep -E -o "[0-9]{1,2}/.[0-9]{1,2}"`
  U_NICE=`echo "( $CNICE - $C_NICE ) / $DIFF * 100" | bc -l | grep -E -o "[0-9]{1,2}/.[0-9]{1,2}"`
  U_SYSM=`echo "( $CSYSM - $C_SYSM ) / $DIFF * 100" | bc -l | grep -E -o "[0-9]{1,2}/.[0-9]{1,2}"`
  U_IDLE=`echo "( $CIDLE - $C_IDLE ) / $DIFF * 100" | bc -l | grep -E -o "[0-9]{1,2}/.[0-9]{1,2}"`

  C_USER=$CUSER
  C_NICE=$CNICE
  C_SYSM=$CSYSM
  C_IDLE=$CIDLE
  C_SUM=$CSUM
}

function stat {
  local REPEAT=1
  local DELAY=1
  if [ -n "$1" ]; then
    REPEAT=$1
  fi
 
  if [ -n "$2" ]; then
    DELAY=$2
  fi

  echo
  echo "---CPU usage statistic---"
  echo "User% Nice% System% Idle%"
  for (( i=1; i<=$REPEAT; i++ )); do
    calculate $DELAY
    echo "${U_USER}% ${U_NICE}% ${U_SYSM}% ${U_IDLE}%"

  done
  echo "-------End------"
}

function help {
cat <<-EOF
 
  Usage: $0 -h or $0 repeat_num delay_time

EOF
}
### Main part of this script ###
stat $1 $2

exit 0