Imports of package shell

PathSynopsis
bytesPackage bytes implements functions for the manipulation of byte slices.
github.com/pkg/errorsPackage errors provides simple error handling primitives.
stringsPackage strings implements simple functions to manipulate UTF-8 encoded strings.
text/scannerPackage scanner provides a scanner and tokenizer for UTF-8-encoded text.
unicodePackage unicode provides data and functions to test some properties of Unicode code points.