Bash，grep文件中的句子

Question

我用 bash 制作了一个简单的答录机。基本上如果你问候它，它会回敬你但现在我在句子分析方面遇到了问题。如果句子 ($@) 超过一个单词，则失败。

if [[ "$@" = $(grep -Fx "$@" 'vocabulary/greeting') ]]
        then
            speak greeting
        elif [[ "$@" = $(grep -Fx "$@" 'vocabulary/appreciative') ]]

输出:

> hello
Sam:  Hi!
> how are you
grep: are: No such file or directory
grep: you: No such file or directory
grep: are: No such file or directory
grep: you: No such file or directory
grep: are: No such file or directory
grep: you: No such file or directory
grep: are: No such file or directory
grep: you: No such file or directory
grep: are: No such file or directory
grep: you: No such file or directory
Sam:  I don't understand.
> 

我该如何解决这个问题？我怎样才能在未来发现这些可能的错误？

Answer 1

使用 "$*" 而不是 "$@"。

if [[ "$*" = "$(grep -Fx "$*" 'vocabulary/greeting')" ]]

"$*" 是参数的字符串表示，而 "$@" 是一个数组。