bash脚本条件检查语句抛出错误

Question

您好，我在下面这一行中遇到错误

  BOOTPROTO="dhcp"
  TEST=$([[ "$BOOTPROTO" =~ (static|none|bootp|dhcp)$ ]] ; echo $?)

我得到的错误在下面

 -bash: command substitution: line 1: unexpected argument `(' to conditional   binary operator
 -bash: command substitution: line 1: syntax error near `(s'
 -bash: command substitution: line 1: `[[ "$BOOTPROTO" =~ (static|none|bootp|dhcp)$ ]] ; echo $?'

我试过手动运行但是无法解决

Answer 1

用引号括起你的正则表达式:

  BOOTPROTO="dhcp"
  TEST=$([[ "$BOOTPROTO" =~ "(static|none|bootp|dhcp)$" ]] ; echo $?)
  echo "$TEST"

或者，如果您使用的是 Bash >= 3.2，则转义括号(正如 Eric 在评论中提到的那样。)

TEST=$([[ "$BOOTPROTO" =~ \(static|none|bootp|dhcp\)$ ]] ; echo $?)

输出:

1