sample

#!/bin/bash

# Bashbars - A portable and easily customisable way to add basic resource information to your MOTD
# A Joint BASH Adventure by IonicOwl & ViscountStyx
# https://github.com/IonicOwl/bashbars
# https://github.com/viscountstyx



# Define colour variables:
DGRAY='\033[90m'
REDBLINK='\033[5;31m'
RED='\033[31m'
CYAN='\033[36m'
RESET='\033[0m'

style=80 # Set the width. Styles are defined below.
seg="=" # Set the character used for bar progress segments.
empty="=" # Set the character used for remaining segments (use a SPACE to show nothing).
segcol=$CYAN # Set the colour for the bar progress segments.
emptycol=$DGRAY # set the colour for the remaining segments.
threshcol=$REDBLINK # Set the colour for highlighted segments when over threshold.

# Define styles here. Style names are arbitrary, but the width of each line is determined by the values
# entered in the col1/2/3 variables, in number of characters.
# E.g:
# |----col1----|-----------------------col2-----------------------|----col3-----|
#        /home [==================================================]    10% / 10GB

if [[ $style == 60 ]]; then col1=13; col2=30; col3=14; fi
if [[ $style == 80 ]]; then col1=13; col2=50; col3=14; fi
if [[ $style == 100 ]]; then col1=18; col2=60; col3=19; fi
if [[ $style == custom ]]; then col1=20; col2=100; col3=20; fi

# Declare bars function:
bars () {
# Setup justification values for lables:
        labelcharsrightpercent=${#3}
        labelcharsrightof=4
        labelcharsrightmaxval=${#4}
        labelcharsrighttotal=$(echo $labelcharsrightpercent+$labelcharsrightof+$labelcharsrightmaxval | bc)
        labelcharsleft=${#1}
        labelspacingright=$(echo $col3-$labelcharsrighttotal | bc)
        labelspacingleft=$(echo $col1-$labelcharsleft | bc)
# Print the spaces before the label for right justification:
        if [[ $labelspacingleft -gt 0 ]]; then printf '%0.s ' $(seq 1 $labelspacingleft); fi
        printf $1
        printf ' ['
        remaining=$(echo $col2-$2 | bc)
# Colour the bar segments the colour defined by $threshcol if the value is over threshold:
        if [[ $5 == 1 ]]; then printf $threshcol; else printf $segcol; fi
# Print the bars:
        if [[ $2 -ge 1 ]]; then printf "%0.s$seg" $(seq 1 $2); printf $RESET; fi
        if [[ $5 == 1 ]]; then printf $RESET; fi
        if [[ $remaining -ge 1 ]]; then printf "%0.s${emptycol}$empty" $(seq 1 $remaining); fi
        printf "${RESET}]"
        if [[ $labelspacingright -gt 0 ]]; then printf '%0.s ' $(seq 1 $labelspacingright); fi
        printf $3
        printf "\045 / "
        printf "$4\n"
}

membar () {
        if [[ $1 == memory ]]
        then
                label="Memory"
                maxval=$(free -h | awk 'NR==2{printf $2}')
                percent=$(free -m | awk 'NR==2{printf "%.0f", $3*100/$2 }')
                        if [[ $percent -gt $2 ]]; then thresh=1; else thresh=0; fi
        fi
        if [[ $1 == swap ]]
        then
                label="Swap"
                maxval=$(free -h | awk 'NR==3{printf $2}')
                percent=$(free -m | awk 'NR==3{printf "%.0f", $3*100/$2 }')
                        if [[ $percent -gt $2 ]]; then thresh=1; else thresh=0; fi
        fi
        barcount=$(echo $percent*$col2/100 | bc)
        bars $label $barcount $percent $maxval $thresh
}

volbar () {
        label=$1
        maxval=$(df -h $1 | awk 'NR==2{printf $2}')
        spaceused=$(df $1 | awk 'NR==2{printf "%.0f", $5}')
        if [[ $spaceused -gt $2 ]]; then thresh=1; else thresh=0; fi
        barcount=$(echo $spaceused*$col2/100 | bc)
        bars $label $barcount $spaceused $maxval $thresh
}

# Declare spacer function (allows a line space to be placed for grouping devices etc).
spacer () {
        printf "\n"
}

# List devices (function, device, threshold%)
spacer
membar memory 90
membar swap 90
spacer
volbar / 90
volbar /home 90
volbar /srv 90
volbar /var 90
volbar /usr 90
spacer