self-copy.sh

Shall高级编程

#!/bin/bash
# self-copy.sh

# This script copies itself.

file_subscript=copy

dd if=$0 of=$0.$file_subscript 2>/dev/null
# Suppress messages from dd:   ^^^^^^^^^^^

exit $?

#  A program whose only output is its own source code
#+ is called a "quine" per Willard Quine.
#  Does this script qualify as a quine?