ProgressBar.bash

#!/data/data/com.termux/files/usr/bin/bash
# Author: Teddy Skarin
# File: ProgressBar.bash
# Date: 21.01.2020
# Last Modified Date: 21.01.2020
# Last Modified By: Cvar1984 <gedzsarjuncomuniti@gmail.com>

# 1. Create ProgressBar function
# 1.1 Input is currentState($1) and totalState($2)
function ProgressBar {
    # Process data
    let _progress=(${1}*100/${2}*100)/100
    let _done=(${_progress}*4)/10
    let _left=40-$_done
    # Build progressbar string lengths
    _done=$(printf "%${_done}s")
    _left=$(printf "%${_left}s")

# 1.2 Build progressbar strings and print the ProgressBar line
# 1.2.1 Output example:
# 1.2.1.1 Progress : [########################################] 100%
printf "\rProgress : [${_done// /#}${_left// /-}] ${_progress}%%"

}

# Variables
_start=1

# This accounts as the "totalState" variable for the ProgressBar function
_end=100

# Proof of concept
for number in $(seq ${_start} ${_end})
do
    sleep 0.1
    ProgressBar ${number} ${_end}
done
printf '\nFinished!\n'