feat(user/zeropad.sh):Add script to zeropad filenames

diff --git a/user/zeropad.sh b/user/zeropad.sh
new file mode 100755 (executable)
index 0000000..9039602
--- /dev/null
+++ b/user/zeropad.sh
@@ -0,0 +1,23 @@
+#!/bin/bash
+# Desc: Zero-pad working dir files with initial digits for sorting
+# Usage: zeropad.sh
+# Version: 0.0.1
+
+# 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;
+
+