这个还是看不懂

wuxiaobo_2009

比如我有个文件alice
$(<alice) 是指的什么，有什么地方用到， eg：xxxx

坐等高手，谢谢。

kk5234

man bash

Command Substitution
       Command substitution allows the output of a command to replace the command name.  There are two forms:

              $(command)
       or
              `command`

       Bash  performs  the expansion by executing command and replacing the command substitution with the stan-
       dard output of the command, with any trailing newlines deleted.  Embedded newlines are not deleted,  but
       they  may be removed during word splitting.  The command substitution $(cat file) can be replaced by the
       equivalent but faster $(< file).