yboetz_motd/30-zpool-bar

#!/bin/bash

# config
max_usage=90
bar_width=50
clear="\e[39m\e[0m"
dim="\e[2m"

zpools=($(zpool list -Ho name | awk '{print $0}'))

printf "\nzpool usage:\n"

for zpool in "${zpools[@]}"
do
    # get zpool usage
    line=$(zpool list -Ho name,cap,size "${zpool}")
    usage=$(echo "$line" | awk '{print $2}' | sed 's/%//')
    used_width=$((($usage*$bar_width)/100))
    # color is green if usage < max_usage, else red
    if [ "${usage}" -ge "${max_usage}" ]; then
        color="\e[31m"
    else
        color="\e[32m"
    fi
    # print green/red bar until used_width
    bar="${color}"
    for sep in $(seq 1 $used_width); do
        bar+="="
    done
    # print dimmmed bar until end
    bar+="${clear}${dim}"
    for sep in $(seq 1 $(($bar_width-$used_width))); do
        bar+="="
    done
    bar="[${bar}${clear}]"
    # print usage line & bar
    echo "${line}" | awk '{ printf("%-10s%+3s used out of %+5s\n", $1, $2, $3); }' | sed -e 's/^/  /'
    echo -e "${bar}" | sed -e 's/^/  /'
done