user/zeropad.sh

   1 #!/bin/bash
   2 # Desc: Zero-pad working dir files with initial digits for sorting
   3 # Usage: zeropad.sh
   4 # Version: 0.0.1
   5
   6 # Find the maximum number of leading digits in the filenames of working dir
   7 max_digits=$(ls -1 * | sed 's/[^0-9].*//' | awk '{ if(length > L) L=length } END { print L }');
   8 declare -p max_digits;
   9
  10 # Loop over the files and rename them
  11 for file in *; do
  12   # Extract the leading digits
  13   digits=$(echo "$file" | sed 's/\([0-9]*\).*/\1/');
  14   # Zero-pad the digits
  15   padded_digits=$(printf "%0${max_digits}d" "$digits");
  16   # Construct the new filename
  17   new_file="${padded_digits}${file#${digits}}";
  18   # Rename the file
  19   mv -n "$file" "$new_file"
  20   # declare -p file new_file; # debug
  21 done;
  22
  23