user/zeropad.sh

   1 #!/bin/bash
   2 # Desc: Zero-pad working dir files with initial digits for sorting
   3 # Usage: zeropad.sh
   4 # Version: 0.0.4
   5
   6 list_files() {
   7     find . -mindepth 1 -maxdepth 1 -type f -exec basename '{}' \; ;
   8 };
   9 main () {
  10     # Find the maximum number of leading digits in the filenames of working dir
  11     max_digits="$(list_files | sed -e 's/[^0-9].*//' | awk '{ if(length > L) L=length } END { print L }')";
  12     # declare -p max_digits; # debug
  13
  14     # Loop over the files and rename them
  15     while read -r file; do
  16         re='^[0-9]+';
  17         if [[ ! "$file" =~ $re ]]; then continue; fi;
  18
  19         # Extract the leading digits
  20         digits="$(echo "$file" | sed 's/\([0-9]*\).*/\1/')";
  21         # Zero-pad the digits
  22         padded_digits="$(printf "%0${max_digits}d" "$digits")";
  23         # Construct the new filename
  24         new_file="${padded_digits}${file#${digits}}";
  25         # Rename the file
  26         mv -n "$file" "$new_file"
  27         # declare -p file new_file; # debug
  28     done < <(list_files);
  29 };
  30
  31 main "$@";
  32
  33
  34
  35
  36 # Author: Steven Baltakatei Sandoval
  37 # License: GPLv3+