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  #!/bin/bash
  # Directory path where .root files are located
  DIR="/storage/gpfs_ams/ams/groups/AMS-Italy/ntuples/v1.1.0/ISS.B1236/pass8"
  # Output file path (explicitly in current directory)
  OUTPUT="$(pwd)/file_list.txt"
  # Minimum and maximum Unix timestamps for filtering
  MIN_TIME=1640994629
  MAX_TIME=1646093960
  # Debug: Show current directory and permissions
  echo "Current directory: $(pwd)"
  echo "Permissions of current directory: $(ls -ld .)"
  # Remove the output file if it already exists
  echo "Removing $OUTPUT if it exists..."
  rm -f "$OUTPUT" || { echo "Error: Cannot remove $OUTPUT, check permissions"; exit 1; }
  # Test write permission
  echo "Testing write permission in $(pwd)..."
  touch "$OUTPUT" || { echo "Error: Cannot create $OUTPUT, no write permission"; exit 1; }
  rm -f "$OUTPUT"
  # Change to the input directory
  echo "Changing to $DIR..."
  cd "$DIR" || { echo "Error: Cannot change to $DIR"; exit 1; }
  # Use ls and awk to filter and sort files in one go
  echo "Generating $OUTPUT..."
  ls -1 *.root | awk -v dir="$DIR" -v min="$MIN_TIME" -v max="$MAX_TIME" '
  {
  # Extract timestamp by removing .root extension
  timestamp = substr($0, 1, length($0)-5)
  # Check if timestamp is numeric and within range
  if (timestamp ~ /^[0-9]+$/ && timestamp > min && timestamp < max) {
  print dir "/" $0
  }
  }' | sort -n > "$OUTPUT" || { echo "Error: Cannot write to $OUTPUT during sort"; exit 1; }
  # Count the number of lines in the output file
  count=$(wc -l < "$OUTPUT")
  # Print completion message
  echo "File $OUTPUT created successfully with $count entries."