高级bash脚本编程指南-4.1变量替换

 

例子 4-1. 变量赋值和替换

33 hello="A B  C   D"
34 echo $hello # A B C D
35 echo "$hello" # A B  C   D       #这里加上双引号“”就可以答应出空格

78 # other_numbers=1 2 3 # 给出一个错误消息.
79 echo "numbers = $numbers"
80 echo "other_numbers = $other_numbers" # other_numbers = 1 2 3
81 # 不过也可以采用将空白转义的方法.
82 mixed_bag=2\ ---\ Whatever      #这里加上“\”转义空格
83 # ^ ^ 在转义符后边的空格(\).
84
85 echo "$mixed_bag" # 2 --- Whatever