How to create the classic Linux progress bar using Bash Script

How to create the classic Linux progress bar using Bash Script. Those who are old enough may remember the old Linux kernel progress bar like this: “|”, “/”, “-“, “\” at the boot time. I quite like this style of the progress bar and decided to assemble a simple script for nostalgia purpose. Fortunately, I found a YouTube video by Kris Occhipinti that does a similar thing.

Below is the classic Linux progress bar code inspired by Kris Occhipinti’s video with some minor modifications:

progress() {
    progressArr=( '|' '/' '-' '\' )
    while [ 1 ]
    do
        for i in "${progressArr[@]}"
        do
            echo -ne "\r$i"
            sleep 0.2
        done
    done
}
 
progress

This code can be combined with cp command to add progress capability to it with some hack. That’s another post for another day.