#!/bin/bash# "and list"if [ ! -z "$1" ] && echo "Argument #1 = $1" && [ ! -z "$2" ] \&& echo "Argument #2 = $2"then  echo "At least 2 arguments passed to script."  # All the chained commands return true.else  echo "Less than 2 arguments passed to script."  # At least one of the chained commands returns false.fi  # Note that "if [ ! -z $1 ]" works, but its supposed equivalent,#   if [ -n $1 ] does not.#     However, quoting fixes this.#  if [ -n "$1" ] works.#     Careful!# It is always best to QUOTE tested variables.# This accomplishes the same thing, using "pure" if/then statements.if [ ! -z "$1" ]then  echo "Argument #1 = $1"fiif [ ! -z "$2" ]then  echo "Argument #2 = $2"  echo "At least 2 arguments passed to script."else  echo "Less than 2 arguments passed to script."fi# It's longer and less elegant than using an "and list".exit 0