Bash数组和路径名扩展:奇怪的输出

Question

我在我的主目录的两个文件.phpsh,并.php_history使用他们的名字我想测试路径名的扩展以及它如何影响在bash关联数组.我遇到的结果似乎很奇怪,我无法解释它们.我在这里尝试了很多变化.

 >my_array_filename_var=(".phpsh"=10 ".php_history" =20)
 >echo ${my_array_filename_var[.phpsh]}
 ERROR
 >echo "${my_array_filename_var[.phpsh]}"
 ERROR
 # This one below understandably doesn't work. But I was pulling my hair out.
 >echo "${my_array_filename_var[".phpsh"]}"
 ERROR
 echo "${my_array_filename_var[\".phpsh\"]}"
 ERROR
 >echo "${my_array_filename_var[.phpsh]}"
 ERROR
 >echo "${my_array_filename_var[phpsh]}"
 .phpsh=10
 >echo "${my_array_filename_var[php_history]}"
 .phpsh=10
 >echo "${my_array_filename_var[\.php_history]}"
 ERROR

当ERROR令牌代表

bash: .phpsh: syntax error: operand expected (error token is ".phpsh")

是否有一些规则说我的关键数组的键中没有点字符？bash中的路径名扩展如何发挥作用？

Answer 1

你应该declare -A(资本A)bash中的关联数组.这是正确的语法:

$ declare -A my_array_filename_var=([.phpsh]=10 [.php_history]=20)
$ echo "${my_array_filename_var[.phpsh]}"
10

要么

$ declare -A my_array_filename_var
$ my_array_filename_var=([.phpsh]=10 [.php_history]=20)
$ echo "${my_array_filename_var[.phpsh]}"
10