user/zeropad.sh

   1 #!/bin/bash
   2 # Desc: Zero-pad working dir files with initial digits for sorting
   3 # Usage: zeropad.sh
   4 # Version: 0.0.3
   5
   6 # Find the maximum number of leading digits in the filenames of working dir
   7 max_digits="$(ls -1 * | sed 's/[^0-9].*//' | awk '{ if(length > L) L=length } END { print L }')";
   8 declare -p max_digits;
   9
  10 # Loop over the files and rename them
  11 while read -r file; do
  12     re='^[0-9]+';
  13     if [[ ! "$file" =~ $re ]]; then continue; fi;
  14
  15     # Extract the leading digits
  16     digits="$(echo "$file" | sed 's/\([0-9]*\).*/\1/')";
  17     # Zero-pad the digits
  18     padded_digits="$(printf "%0${max_digits}d" "$digits")";
  19     # Construct the new filename
  20     new_file="${padded_digits}${file#${digits}}";
  21     # Rename the file
  22     mv -n "$file" "$new_file"
  23     # declare -p file new_file; # debug
  24 done < <(find . -mindepth 1 -maxdepth 1 -type f);
  25
  26 # Author: Steven Baltakatei Sandoval
  27 # License: GPLv3+