perl - $@ 和 $! 之间的区别在 perl 中

Question

$@有什么区别和 $!在 Perl 中？与 eval 相关的错误使用 $@ 输出. $!也用于捕获错误。那么两者有什么区别呢？

Answer 1

来自 perldoc perlvar :

The variables $@ , $! , $^E , and $? contain information about different types of error conditions that may appear during execution of a Perl program. The variables are shown ordered by the "distance" between the subsystem which reported the error and the Perl process. They correspond to errors detected by the Perl interpreter, C library, operating system, or an external program, respectively.