dwmstatusbar

#!/bin/bash

INTERVAL=1  # refresh interval [s]
NETWORK_INTERFACES="enp0s31f6"  # separated by spaces
DL="  |  "  # delimiter


print_memfree() {
    memfree=$(($(grep -m1 'MemAvailable:' /proc/meminfo | awk '{print $2}') / 1024))"M"
    echo -e "MEM $memfree"
}

print_date() {
    date "+%a %m-%d %T"
}

print_mem_killer() {
    cpu_killer=$(basename $(ps -eo pmem,pcpu,vsize,pid,cmd | sort -k 1 -nr | head -1|awk '{print $5}'))
    echo -e $cpu_killer
}

print_cpu_killer() {
    cpu_killer=$(basename $(ps -eo pmem,pcpu,vsize,pid,cmd | sort -k 2 -nr | head -1|awk '{print $5}'))
    echo -e $cpu_killer
}

print_volume() {
    VOL=$(amixer get Master | tail -1 | sed 's/.*\[\([0-9]*%\)\].*/\1/')
    echo $VOL
}

print_main_fs_usage() {
    FS_USAGE=$(df |grep /$ | awk '{print $5}')
    echo -e "/ $FS_USAGE"
}

print_data_fs_usage() {
    FS_USAGE=$(df |grep /data$ | awk '{print $5}')
    echo -e "/data $FS_USAGE"
}

tx_old=0
rx_old=0
# setopt shwordsplit
for NETWORK_INTERFACE in ${NETWORK_INTERFACES}; do
    tx_old=$(cat /sys/class/net/${NETWORK_INTERFACE}/statistics/tx_bytes)
    rx_old=$(cat /sys/class/net/${NETWORK_INTERFACE}/statistics/rx_bytes)
done
# unsetopt shwordsplit

while true; do
    rx_now=0
    tx_now=0
    for NETWORK_INTERFACE in ${NETWORK_INTERFACES}; do
        tx_now=$(($rx_now + $(cat /sys/class/net/${NETWORK_INTERFACE}/statistics/tx_bytes)))
        rx_now=$(($rx_now + $(cat /sys/class/net/${NETWORK_INTERFACE}/statistics/rx_bytes)))
    done

    let rx_rate=($rx_now-$rx_old)/1024/$INTERVAL
    let tx_rate=($tx_now-$tx_old)/1024/$INTERVAL

    xsetroot -name "MEM† $(print_mem_killer)${DL}CPU† $(print_cpu_killer)${DL}V $(print_volume)${DL}RX $rx_rate kb/s${DL}TX $tx_rate kb/s${DL}$(print_memfree)${DL}$(print_main_fs_usage)${DL}$(print_data_fs_usage)${DL}$(print_date)"
    sleep $INTERVAL

    tx_old=$tx_now
    rx_old=$rx_now
done