# Escape to POSIX Shell (sh).
	#
	# Abort if the text contains a null byte.
	#
	# ~~~
	# assert "\n\"'\\\{\}0".escape_to_sh == "'\n\"'\\''\\\{\}0'"
	# ~~~
	fun escape_to_sh: String do
		var b = new Buffer
		b.chars.add '\''
		for i in [0..length[ do
			var c = chars[i]
			if c == '\'' then
				b.append("'\\''")
			else
				assert without_null_byte: c != '\0'
				b.add(c)
			end
		end
		b.chars.add '\''
		return b.to_s
	end