For all processes with an command, run this command under their /proc/<pid>

forproc

function filter_pids() {
    oifs="$IFS"
    IFS=$'\n'
    for stuff in $1; do
        if [[ -f $stuff/cmdline ]]; then
            echo "$stuff"
        fi
    done
    IFS="$oifs"
}

function filter_cmd() {
    oifs="$IFS"
    IFS=$'\n'
    for pid in $1; do
        proc=$(cat "$pid/comm")
        if [[ "$proc" == "$2" ]]; then
            echo "$pid"
        fi
    done
    IFS="$oifs"
}

function execute_rest() {
        oifs="$IFS"
        IFS=$'\n'
        pids="$1"
        shift
        for pid in $pids; do
            opwd="$PWD"
            cd $pid
            echo "------------------------------------------------------------------------------"
            $@
            echo "=============================================================================="
            cd "$opwd"
        done
        IFS="$oifs"
}

echo "Running for all processes with command $1"
cmd="$1"
shift

procstuff=$(ls /proc)
pids=$(filter_pids "$procstuff")
match=$(filter_cmd "$pids" "$cmd")

execute_rest "$match" "$@"