Bash: Ensure processes run on allowed CPUs

gistfile1.txt

#!/bin/bash

# function to expand the range of allowed CPUs
range_expand () (
    IFS=,
    set -- $1
    n=$#
    for element; do
        if [[ $element =~ ^(-?[0-9]+)-(-?[0-9]+)$ ]]; then
            set -- "$@" $(eval echo "{${BASH_REMATCH[1]}..${BASH_REMATCH[2]}}")
        else
            set -- "$@" $element
        fi
    done
    shift $n
    echo "$@"
)

# Loop through all processes
for i in $(ps -A -o pid=); do
    allowed=$(range_expand $(grep Cpus_allowed_list /proc/${i}/status | awk '{ print $2 }'))
    running=$(set -- $(</proc/${i}/stat); echo ${39})
    if [[ "${allowed/$running}" = "${allowed}" ]] && [[ "${allowed}" ]]; then
        printf "Process %d running on CPU %d but only allowed on %s\n" "$i" "$running" "$allowed"
    fi
done 2>/dev/null # otherwise we get errors for some short lived processes like the grep invocation used