ps -C process_name  -o pid=

# !/bin/bash
# author:robin
# usage: bash proc.sh openresty
if [ -e cpu_mr.log ]
then
    rm -f cpu_mr.log
fi
 
pid_array=(122)
 
name=$1
if [ -z "$name" ] 
then
    name="openresty"
fi
#echo $name
 
#cpucmd: '-p 125 -p 235 -p 568'
cpucmd=''
i=0
 
#get all pid by proName
funGetPids(){
    tempstr=`ps -C $name -o pid=`
    #echo $tempstr
 
    
    for line in $tempstr
    do
        pid_array[$i]=$line
        #echo ${pid_array[$i]}
        let "i++"
        cpucmd=${cpucmd}" -p $line "
    done 
    return
}
funGetPids
 
if [ $i -eq 0 ] 
then
echo "{\"sum_vmrss\": -1,  \"sum_cpu\": -1 }"
exit 0
fi
 
sum_vmrss=0
sum_cpu=0.0
#compute mem sum
for pid in  ${pid_array[@]}
do
    vmrss_temp=`cat /proc/$pid/status|grep -e VmRSS|tr -d [:blank:][:alpha:][:]`
    #echo 'vmrss_temp= '  $vmrss_temp
    sum_vmrss=`expr $sum_vmrss + $vmrss_temp`
done
 
#echo $cpucmd
tempstr=`top -n 1 $cpucmd |tail -n +8 | awk '{print $10}'`
 
for line in $tempstr
do
#echo $line
sum_cpu=$(echo "$sum_cpu+$line"|bc)
done
 
# echo "-------------------"
echo "{\"sum_vmrss\": $sum_vmrss,  \"sum_cpu\": $sum_cpu }"
 
exit

bash proc.sh  gnome-shell