A shell function easy to unpack PKG file.

unpkg.sh

# unpkg
# Usage: unpkg xxx.pkg
unpkg() {
  filepath=$(dirname -- "$1")
  filename=$(basename -- "$1")
  input="$filepath/$filename"
  output="$filepath/${filename%.*}"
  pkgutil --expand $input $output
  find $output -type f -name 'Payload' -exec tar -xf {} -C $filepath \;
}