progress_bar.bash

#!/bin/bash

# modification of https://github.com/fearside/ProgressBar/

# 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-$_done
    # Build progressbar string lengths
    _fill=$(printf "%${_done}s")
    _empty=$(printf "%${_left}s")
    
    # 1.2 Build progressbar strings and print the ProgressBar line
    # 1.2.1 Output example:
    # 1.2.1.1 Progress : [########################################] 100%
    if [ $_left -eq 0 ]
    then
	# clear our the progress bar
	printf "\r\033[K"
    else
	printf "\rProgress : [${_fill// /#}${_empty// /-}] ${_progress}%%"
    fi
}