#!/bin/bash

if [ -z "$1" ]; then
  echo "Usage: $0 <file_extension>"
  exit 1
fi

EXTENSION="$1"
TMP_FILE="/tmp/temp.txt"

find . -type f -name "*.${EXTENSION}" -print0 | xargs -0 cat > "$TMP_FILE"
pbcopy < "$TMP_FILE"
rm -f "$TMP_FILE"