Progress bar in the shell

progress.sh

#!/bin/bash

function pb_init() {
  # define the progress bar size (in characters)
  PROGRESS_BAR_SIZE=20
  # Hide the cursor
  printf "\033[?25l"
  # Show cursor on exit
  trap 'printf "\033[?25h"' 0
}

function pb_progress() {
  local progress
  local remaining
  local completed
  local uncompleted

  progress=$(echo "$PROGRESS_BAR_SIZE * $1 / $2" | bc)
  remaining=$(echo "$PROGRESS_BAR_SIZE - $progress" | bc)
  # Create string with ${progress} spaces in it
  completed=$(printf "%${progress}s")
  # Create string with ${remaining} spaces in it
  uncompleted=$(printf "%${remaining}s")
  # Substitute spaces with # or -
  # See http://tldp.org/LDP/abs/html/string-manipulation.html
  printf "[${completed// /#}${uncompleted// /-}]\r"
}

# This is user defined and is the expected number of iterations
end_value=153

pb_init
for current_value in $(seq 1 $end_value)
do
  pb_progress $current_value $end_value
  # Do something
  sleep 0.1
done