为什么这样写无法连接(join)数组各项? - V2EX
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wxf666
V2EX    Bash

为什么这样写无法连接(join)数组各项?

  •  
  •   wxf666 2022-08-13 19:53:14 +08:00 1648 次点击
    这是一个创建于 1205 天前的主题,其中的信息可能已经有所发展或是发生改变。
    # 声明数组 declare -a arr=(12 34 56 78 90) # 稍后我想用 , 连接它们 IFS=',' # 测试一:我想连接数组前三个数字( OK ) cat <<<"${arr[*]:0:3}" # 测试二:在 HereDoc 里,同样的写法,逗号却不见了?(除非全部连接,不指定其中一小段) cat <<EOF ${arr[*]:0:3} ${arr[*]} EOF 

    结果:

    12,34,56 # 测试一,OK 12 34 56 # 测试二,???不是和上面写法一样吗??? 12,34,56,78,90 # 测试二,全部连接,OK 

    又被 bash 折磨了。。

    3 条回复    2022-09-10 00:25:51 +08:00
    aloxaf
        1
    aloxaf  
       2022-09-01 23:16:47 +08:00
    确实,试了下 zsh 的行为是期望的
    bash 迷惑行为 + 1
    aloxaf
        2
    aloxaf  
       2022-09-03 09:35:48 +08:00
    在邮件列表里问了一下,应该是 BUG ,5.0 以前的行为是正常的
    hxy100
        3
    hxy100  
       2022-09-10 00:25:51 +08:00
    Bug +1 ,我本地用 Cygwin 测试正常;

    ---

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