如下，想要获得11.pl的路径，相对路径和绝对路径：

zczhangjx@zctech-chengjb:~/智呈监控系统/shell-perl$ ./11.pl
./11.pl
/home/zczhangjx/智呈监控系统/shell-perl/11.pl

#!/usr/bin/perl
use File::Basename;     
print "$0\n";

use Cwd 'abs_path';
use warnings;
print(abs_path($0)."\n");