chore(user/zeropad.sh):Add license

[BK-2020-03.git] / user / zeropad.sh

#!/bin/bash
# Desc: Zero-pad working dir files with initial digits for sorting
# Usage: zeropad.sh
# Version: 0.0.2

# Find the maximum number of leading digits in the filenames of working dir
max_digits="$(ls -1 * | sed 's/[^0-9].*//' | awk '{ if(length > L) L=length } END { print L }')";
declare -p max_digits;

# Loop over the files and rename them
for file in *; do
  # Extract the leading digits
  digits="$(echo "$file" | sed 's/\([0-9]*\).*/\1/')";
  # Zero-pad the digits
  padded_digits="$(printf "%0${max_digits}d" "$digits")";
  # Construct the new filename
  new_file="${padded_digits}${file#${digits}}";
  # Rename the file
  mv -n "$file" "$new_file"
  # declare -p file new_file; # debug
done;

# Author: Steven Baltakatei Sandoval
# License: GPLv3+